31891042 has 8 divisors (see below), whose sum is σ = 47861100. Its totient is φ = 15937344.

The previous prime is 31890979. The next prime is 31891061. The reversal of 31891042 is 24019813.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31371201 + 519841 = 5601^2 + 721^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 31891042.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3934 + ... + 8902.

Almost surely, 2^31891042 is an apocalyptic number.

31891042 is a deficient number, since it is larger than the sum of its proper divisors (15970058).

31891042 is a wasteful number, since it uses less digits than its factorization.

31891042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8180.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 31891042 is about 5647.2154200101. The cubic root of 31891042 is about 317.1194672227.

The spelling of 31891042 in words is "thirty-one million, eight hundred ninety-one thousand, forty-two".