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1311152121 = 32563258763
BaseRepresentation
bin100111000100110…
…1001011111111001
310101101011102120200
41032021221133321
510141123331441
6334034312413
744330415636
oct11611513771
93341142520
101311152121
11613124aa4
12307128709
1317b841076
14c61c518d
157a1947b6
hex4e2697f9

1311152121 has 12 divisors (see below), whose sum is σ = 1897257648. Its totient is φ = 872545464.

The previous prime is 1311152093. The next prime is 1311152131. The reversal of 1311152121 is 1212511131.

1311152121 is a `hidden beast` number, since 13 + 111 + 521 + 21 = 666.

It is not a de Polignac number, because 1311152121 - 219 = 1310627833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311152094 and 1311152103.

It is not an unprimeable number, because it can be changed into a prime (1311152131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124315 + ... + 134448.

It is an arithmetic number, because the mean of its divisors is an integer number (158104804).

Almost surely, 21311152121 is an apocalyptic number.

It is an amenable number.

1311152121 is a deficient number, since it is larger than the sum of its proper divisors (586105527).

1311152121 is a wasteful number, since it uses less digits than its factorization.

1311152121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259332 (or 259329 counting only the distinct ones).

The product of its digits is 60, while the sum is 18.

The square root of 1311152121 is about 36209.8345895145. The cubic root of 1311152121 is about 1094.5048590190.

Adding to 1311152121 its reverse (1212511131), we get a palindrome (2523663252).

The spelling of 1311152121 in words is "one billion, three hundred eleven million, one hundred fifty-two thousand, one hundred twenty-one".

Divisors: 1 3 9 563 1689 5067 258763 776289 2328867 145683569 437050707 1311152121