31672919 has 2 divisors, whose sum is σ = 31672920. Its totient is φ = 31672918.

The previous prime is 31672903. The next prime is 31672933. The reversal of 31672919 is 91927613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31672919 - 2⁴ = 31672903 is a prime.

It is a super-2 number, since 2×31672919² = 2006347595961122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31672939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15836459 + 15836460.

It is an arithmetic number, because the mean of its divisors is an integer number (15836460).

Almost surely, 2^31672919 is an apocalyptic number.

31672919 is a deficient number, since it is larger than the sum of its proper divisors (1).

31672919 is an equidigital number, since it uses as much as digits as its factorization.

31672919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 31672919 is about 5627.8698456876. The cubic root of 31672919 is about 316.3948190802.

The spelling of 31672919 in words is "thirty-one million, six hundred seventy-two thousand, nine hundred nineteen".