31148729 has 2 divisors, whose sum is σ = 31148730. Its totient is φ = 31148728.

The previous prime is 31148723. The next prime is 31148749. The reversal of 31148729 is 92784113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 4108729 = 5200^2 + 2027^2 .

It is a cyclic number.

It is not a de Polignac number, because 31148729 - 2⁸ = 31148473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31148723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15574364 + 15574365.

It is an arithmetic number, because the mean of its divisors is an integer number (15574365).

Almost surely, 2^31148729 is an apocalyptic number.

It is an amenable number.

31148729 is a deficient number, since it is larger than the sum of its proper divisors (1).

31148729 is an equidigital number, since it uses as much as digits as its factorization.

31148729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 31148729 is about 5581.1046397644. The cubic root of 31148729 is about 314.6396450261.

The spelling of 31148729 in words is "thirty-one million, one hundred forty-eight thousand, seven hundred twenty-nine".