31144609 has 2 divisors, whose sum is σ = 31144610. Its totient is φ = 31144608.

The previous prime is 31144601. The next prime is 31144613. The reversal of 31144609 is 90644113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22896225 + 8248384 = 4785^2 + 2872^2 .

It is a cyclic number.

It is not a de Polignac number, because 31144609 - 2³ = 31144601 is a prime.

It is not a weakly prime, because it can be changed into another prime (31144601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572304 + 15572305.

It is an arithmetic number, because the mean of its divisors is an integer number (15572305).

Almost surely, 2^31144609 is an apocalyptic number.

It is an amenable number.

31144609 is a deficient number, since it is larger than the sum of its proper divisors (1).

31144609 is an equidigital number, since it uses as much as digits as its factorization.

31144609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31144609 is about 5580.7355250003. The cubic root of 31144609 is about 314.6257720952.

The spelling of 31144609 in words is "thirty-one million, one hundred forty-four thousand, six hundred nine".