31916953 has 4 divisors (see below), whose sum is σ = 32095440. Its totient is φ = 31738468.

The previous prime is 31916947. The next prime is 31916993. The reversal of 31916953 is 35961913.

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: 35961913 = 13 ⋅2766301.

It is a cyclic number.

It is not a de Polignac number, because 31916953 - 2¹³ = 31908761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31916993) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 88975 + ... + 89332.

It is an arithmetic number, because the mean of its divisors is an integer number (8023860).

Almost surely, 2^31916953 is an apocalyptic number.

It is an amenable number.

31916953 is a deficient number, since it is larger than the sum of its proper divisors (178487).

31916953 is a wasteful number, since it uses less digits than its factorization.

31916953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178486.

The product of its digits is 21870, while the sum is 37.

The square root of 31916953 is about 5649.5090937178. The cubic root of 31916953 is about 317.2053289322.

The spelling of 31916953 in words is "thirty-one million, nine hundred sixteen thousand, nine hundred fifty-three".