131210400402 has 12 divisors (see below), whose sum is σ = 284289200910. Its totient is φ = 43736800128.

The previous prime is 131210400397. The next prime is 131210400473. The reversal of 131210400402 is 204004012131.

131210400402 is a `hidden beast` number, since 13 + 1 + 210 + 40 + 0 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 97432003881 + 33778396521 = 312141^2 + 183789^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 7289466689 = 131210400402 / (1 + 3 + 1 + 2 + 1 + 0 + 4 + 0 + 0 + 4 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3644733327 + ... + 3644733362.

Almost surely, 2^131210400402 is an apocalyptic number.

131210400402 is an abundant number, since it is smaller than the sum of its proper divisors (153078800508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131210400402 is a wasteful number, since it uses less digits than its factorization.

131210400402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7289466697 (or 7289466694 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 131210400402 its reverse (204004012131), we get a palindrome (335214412533).

The spelling of 131210400402 in words is "one hundred thirty-one billion, two hundred ten million, four hundred thousand, four hundred two".