402151531 has 4 divisors (see below), whose sum is σ = 404559792. Its totient is φ = 399743272.

The previous prime is 402151501. The next prime is 402151553. The reversal of 402151531 is 135151204.

It is a happy number.

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 402151531 - 2⁷ = 402151403 is a prime.

It is a super-2 number, since 2×402151531² = 323451707771287922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402151501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203880 + ... + 1204213.

It is an arithmetic number, because the mean of its divisors is an integer number (101139948).

Almost surely, 2^402151531 is an apocalyptic number.

402151531 is a deficient number, since it is larger than the sum of its proper divisors (2408261).

402151531 is a wasteful number, since it uses less digits than its factorization.

402151531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408260.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 402151531 is about 20053.7161394092. The cubic root of 402151531 is about 738.1249895406.

The spelling of 402151531 in words is "four hundred two million, one hundred fifty-one thousand, five hundred thirty-one".