31442897 has 4 divisors (see below), whose sum is σ = 32457216. Its totient is φ = 30428580.

The previous prime is 31442893. The next prime is 31442921. The reversal of 31442897 is 79824413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79824413 = 53 ⋅1506121.

It is a cyclic number.

It is not a de Polignac number, because 31442897 - 2² = 31442893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31442897.

It is not an unprimeable number, because it can be changed into a prime (31442893) 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, 507113 + ... + 507174.

It is an arithmetic number, because the mean of its divisors is an integer number (8114304).

Almost surely, 2^31442897 is an apocalyptic number.

It is an amenable number.

31442897 is a deficient number, since it is larger than the sum of its proper divisors (1014319).

31442897 is a wasteful number, since it uses less digits than its factorization.

31442897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014318.

The product of its digits is 48384, while the sum is 38.

The square root of 31442897 is about 5607.3966330196. The cubic root of 31442897 is about 315.6270268406.

The spelling of 31442897 in words is "thirty-one million, four hundred forty-two thousand, eight hundred ninety-seven".