31516442 has 4 divisors (see below), whose sum is σ = 47274666. Its totient is φ = 15758220.

The previous prime is 31516427. The next prime is 31516469. The reversal of 31516442 is 24461513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31013761 + 502681 = 5569^2 + 709^2 .

It is a super-2 number, since 2×31516442² = 1986572232678728, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7879109 + ... + 7879112.

Almost surely, 2^31516442 is an apocalyptic number.

31516442 is a deficient number, since it is larger than the sum of its proper divisors (15758224).

31516442 is a wasteful number, since it uses less digits than its factorization.

31516442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15758223.

The product of its digits is 2880, while the sum is 26.

The square root of 31516442 is about 5613.9506588498. The cubic root of 31516442 is about 315.8729193116.

Adding to 31516442 its reverse (24461513), we get a palindrome (55977955).

The spelling of 31516442 in words is "thirty-one million, five hundred sixteen thousand, four hundred forty-two".