31719089 has 2 divisors, whose sum is σ = 31719090. Its totient is φ = 31719088.

The previous prime is 31719071. The next prime is 31719119. The reversal of 31719089 is 98091713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31584400 + 134689 = 5620^2 + 367^2 .

It is an emirp because it is prime and its reverse (98091713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31719089 - 2⁸ = 31718833 is a prime.

It is a super-2 number, since 2×31719089² = 2012201213979842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31719029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15859544 + 15859545.

It is an arithmetic number, because the mean of its divisors is an integer number (15859545).

Almost surely, 2^31719089 is an apocalyptic number.

It is an amenable number.

31719089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31719089 is an equidigital number, since it uses as much as digits as its factorization.

31719089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 31719089 is about 5631.9702591544. The cubic root of 31719089 is about 316.5484819668.

The spelling of 31719089 in words is "thirty-one million, seven hundred nineteen thousand, eighty-nine".