402566131 has 4 divisors (see below), whose sum is σ = 439163064. Its totient is φ = 365969200.

The previous prime is 402566089. The next prime is 402566141. The reversal of 402566131 is 131665204.

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 402566131 - 2²¹ = 400468979 is a prime.

It is a super-2 number, since 2×402566131² = 324118979656618322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402566131.

It is not an unprimeable number, because it can be changed into a prime (402566141) 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, 18298450 + ... + 18298471.

It is an arithmetic number, because the mean of its divisors is an integer number (109790766).

Almost surely, 2^402566131 is an apocalyptic number.

402566131 is a deficient number, since it is larger than the sum of its proper divisors (36596933).

402566131 is a wasteful number, since it uses less digits than its factorization.

402566131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36596932.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 402566131 is about 20064.0507126552. The cubic root of 402566131 is about 738.3785602229.

The spelling of 402566131 in words is "four hundred two million, five hundred sixty-six thousand, one hundred thirty-one".