31158642 has 8 divisors (see below), whose sum is σ = 62317296. Its totient is φ = 10386212.

The previous prime is 31158641. The next prime is 31158661. The reversal of 31158642 is 24685113.

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

31158642 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (31158641) 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, 2596548 + ... + 2596559.

It is an arithmetic number, because the mean of its divisors is an integer number (7789662).

Almost surely, 2^31158642 is an apocalyptic number.

31158642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31158642 is a wasteful number, since it uses less digits than its factorization.

31158642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5193112.

The product of its digits is 5760, while the sum is 30.

The square root of 31158642 is about 5581.9926549575. The cubic root of 31158642 is about 314.6730192288.

The spelling of 31158642 in words is "thirty-one million, one hundred fifty-eight thousand, six hundred forty-two".