31191442 has 8 divisors (see below), whose sum is σ = 46871100. Its totient is φ = 15567744.

The previous prime is 31191439. The next prime is 31191449. The reversal of 31191442 is 24419113.

31191442 = T₃ + T₄ + ... + T₅₇₁.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24591681 + 6599761 = 4959^2 + 2569^2 .

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 (31191449) 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, 12567 + ... + 14842.

Almost surely, 2^31191442 is an apocalyptic number.

31191442 is a deficient number, since it is larger than the sum of its proper divisors (15679658).

31191442 is a wasteful number, since it uses less digits than its factorization.

31191442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27980.

The product of its digits is 864, while the sum is 25.

The square root of 31191442 is about 5584.9299010820. The cubic root of 31191442 is about 314.7833969050.

The spelling of 31191442 in words is "thirty-one million, one hundred ninety-one thousand, four hundred forty-two".