31085402 has 8 divisors (see below), whose sum is σ = 47888436. Its totient is φ = 15122592.

The previous prime is 31085393. The next prime is 31085407. The reversal of 31085402 is 20458013.

It can be written as a sum of positive squares in 2 ways, for example, as 21169201 + 9916201 = 4601^2 + 3149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31085407) 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, 209963 + ... + 210110.

Almost surely, 2^31085402 is an apocalyptic number.

31085402 is a deficient number, since it is larger than the sum of its proper divisors (16803034).

31085402 is a wasteful number, since it uses less digits than its factorization.

31085402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420112.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 31085402 is about 5575.4284140324. The cubic root of 31085402 is about 314.4262740616.

The spelling of 31085402 in words is "thirty-one million, eighty-five thousand, four hundred two".