402131131 has 4 divisors (see below), whose sum is σ = 402447312. Its totient is φ = 401814952.

The previous prime is 402131129. The next prime is 402131153. The reversal of 402131131 is 131131204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402131131 - 2¹ = 402131129 is a prime.

It is a super-2 number, since 2×402131131² = 323418893038678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402131111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156175 + ... + 158728.

It is an arithmetic number, because the mean of its divisors is an integer number (100611828).

Almost surely, 2^402131131 is an apocalyptic number.

402131131 is a deficient number, since it is larger than the sum of its proper divisors (316181).

402131131 is a wasteful number, since it uses less digits than its factorization.

402131131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316180.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 402131131 is about 20053.2074990511. The cubic root of 402131131 is about 738.1125083379.

Adding to 402131131 its reverse (131131204), we get a palindrome (533262335).

The spelling of 402131131 in words is "four hundred two million, one hundred thirty-one thousand, one hundred thirty-one".