402031161 has 16 divisors (see below), whose sum is σ = 680688000. Its totient is φ = 229731984.

The previous prime is 402031153. The next prime is 402031169. The reversal of 402031161 is 161130204.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (402031153) and next prime (402031169).

It is not a de Polignac number, because 402031161 - 2³ = 402031153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402031169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1063386 + ... + 1063763.

It is an arithmetic number, because the mean of its divisors is an integer number (42543000).

Almost surely, 2^402031161 is an apocalyptic number.

It is an amenable number.

402031161 is a deficient number, since it is larger than the sum of its proper divisors (278656839).

402031161 is a wasteful number, since it uses less digits than its factorization.

402031161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127165 (or 2127159 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 402031161 is about 20050.7147254157. The cubic root of 402031161 is about 738.0513382225.

Adding to 402031161 its reverse (161130204), we get a palindrome (563161365).

The spelling of 402031161 in words is "four hundred two million, thirty-one thousand, one hundred sixty-one".