402001131 has 32 divisors (see below), whose sum is σ = 626434560. Its totient is φ = 224550144.

The previous prime is 402001111. The next prime is 402001133. The reversal of 402001131 is 131100204.

It is a happy number.

It is not a de Polignac number, because 402001131 - 2⁵ = 402001099 is a prime.

It is a super-2 number, since 2×402001131² = 323209818650558322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402001133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421351 + ... + 422303.

It is an arithmetic number, because the mean of its divisors is an integer number (19576080).

Almost surely, 2^402001131 is an apocalyptic number.

402001131 is a deficient number, since it is larger than the sum of its proper divisors (224433429).

402001131 is a wasteful number, since it uses less digits than its factorization.

402001131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 402001131 is about 20049.9658603201. The cubic root of 402001131 is about 738.0329613439.

Adding to 402001131 its reverse (131100204), we get a palindrome (533101335).

The spelling of 402001131 in words is "four hundred two million, one thousand, one hundred thirty-one".