1311102621 has 6 divisors (see below), whose sum is σ = 1893814910. Its totient is φ = 874068408.

The previous prime is 1311102599. The next prime is 1311102643. The reversal of 1311102621 is 1262011131.

1311102621 is a `hidden beast` number, since 1 + 31 + 1 + 10 + 2 + 621 = 666.

It is an interprime number because it is at equal distance from previous prime (1311102599) and next prime (1311102643).

It can be written as a sum of positive squares in only one way, i.e., 1301405625 + 9696996 = 36075^2 + 3114^2 .

It is not a de Polignac number, because 1311102621 - 2⁵ = 1311102589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311102594 and 1311102603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311102691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72839026 + ... + 72839043.

Almost surely, 2^1311102621 is an apocalyptic number.

It is an amenable number.

1311102621 is a deficient number, since it is larger than the sum of its proper divisors (582712289).

1311102621 is a wasteful number, since it uses less digits than its factorization.

1311102621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145678075 (or 145678072 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1311102621 is about 36209.1510670990. The cubic root of 1311102621 is about 1094.4910852111.

Adding to 1311102621 its reverse (1262011131), we get a palindrome (2573113752).

The spelling of 1311102621 in words is "one billion, three hundred eleven million, one hundred two thousand, six hundred twenty-one".