31979019 has 4 divisors (see below), whose sum is σ = 42638696. Its totient is φ = 21319344.

The previous prime is 31978979. The next prime is 31979029. The reversal of 31979019 is 91097913.

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

It is a de Polignac number, because none of the positive numbers 2^k-31979019 is a prime.

It is a super-2 number, since 2×31979019² = 2045315312404722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31979029) 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, 5329834 + ... + 5329839.

It is an arithmetic number, because the mean of its divisors is an integer number (10659674).

Almost surely, 2^31979019 is an apocalyptic number.

31979019 is a deficient number, since it is larger than the sum of its proper divisors (10659677).

31979019 is a wasteful number, since it uses less digits than its factorization.

31979019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10659676.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 31979019 is about 5654.9994694960. Note that the first 3 decimals coincide. The cubic root of 31979019 is about 317.4108092623.

The spelling of 31979019 in words is "thirty-one million, nine hundred seventy-nine thousand, nineteen".