31672889 has 2 divisors, whose sum is σ = 31672890. Its totient is φ = 31672888.

The previous prime is 31672871. The next prime is 31672891. The reversal of 31672889 is 98827613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17572864 + 14100025 = 4192^2 + 3755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31672889 is a prime.

Together with 31672891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31672859) 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 as a sum of consecutive naturals, namely, 15836444 + 15836445.

It is an arithmetic number, because the mean of its divisors is an integer number (15836445).

Almost surely, 2^31672889 is an apocalyptic number.

It is an amenable number.

31672889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31672889 is an equidigital number, since it uses as much as digits as its factorization.

31672889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 31672889 is about 5627.8671803801. The cubic root of 31672889 is about 316.3947191857.

The spelling of 31672889 in words is "thirty-one million, six hundred seventy-two thousand, eight hundred eighty-nine".