402100031 has 16 divisors (see below), whose sum is σ = 433589760. Its totient is φ = 371521920.

The previous prime is 402099989. The next prime is 402100033. The reversal of 402100031 is 130001204.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402100031 is a prime.

It is a super-2 number, since 2×402100031² = 323368869860401922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402099985 and 402100021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402100033) 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, 558890 + ... + 559608.

It is an arithmetic number, because the mean of its divisors is an integer number (27099360).

Almost surely, 2^402100031 is an apocalyptic number.

402100031 is a deficient number, since it is larger than the sum of its proper divisors (31489729).

402100031 is a wasteful number, since it uses less digits than its factorization.

402100031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 402100031 is about 20052.4320470112. The cubic root of 402100031 is about 738.0934798096.

Adding to 402100031 its reverse (130001204), we get a palindrome (532101235).

The spelling of 402100031 in words is "four hundred two million, one hundred thousand, thirty-one".