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1285131 = 31034159
BaseRepresentation
bin100111001110000001011
32102021212110
410321300023
5312111011
643313403
713631511
oct4716013
92367773
101285131
117a85a1
1251b863
1335cc43
142564b1
151a5ba6
hex139c0b

1285131 has 8 divisors (see below), whose sum is σ = 1730560. Its totient is φ = 848232.

The previous prime is 1285129. The next prime is 1285139. The reversal of 1285131 is 1315821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1285131 - 21 = 1285129 is a prime.

It is a super-2 number, since 2×12851312 = 3303123374322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1285098 and 1285107.

It is not an unprimeable number, because it can be changed into a prime (1285139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1771 + ... + 2388.

It is an arithmetic number, because the mean of its divisors is an integer number (216320).

21285131 is an apocalyptic number.

1285131 is a deficient number, since it is larger than the sum of its proper divisors (445429).

1285131 is a wasteful number, since it uses less digits than its factorization.

1285131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4265.

The product of its digits is 240, while the sum is 21.

The square root of 1285131 is about 1133.6361850259. The cubic root of 1285131 is about 108.7215912054.

The spelling of 1285131 in words is "one million, two hundred eighty-five thousand, one hundred thirty-one".

Divisors: 1 3 103 309 4159 12477 428377 1285131