31460729 has 2 divisors, whose sum is σ = 31460730. Its totient is φ = 31460728.

The previous prime is 31460717. The next prime is 31460743. The reversal of 31460729 is 92706413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 769129 = 5540^2 + 877^2 .

It is a cyclic number.

It is not a de Polignac number, because 31460729 - 2¹⁶ = 31395193 is a prime.

It is a super-2 number, since 2×31460729² = 1979554938422882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31460695 and 31460704.

It is not a weakly prime, because it can be changed into another prime (31460129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15730364 + 15730365.

It is an arithmetic number, because the mean of its divisors is an integer number (15730365).

Almost surely, 2^31460729 is an apocalyptic number.

It is an amenable number.

31460729 is a deficient number, since it is larger than the sum of its proper divisors (1).

31460729 is an equidigital number, since it uses as much as digits as its factorization.

31460729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 31460729 is about 5608.9864503313. The cubic root of 31460729 is about 315.6866820467.

The spelling of 31460729 in words is "thirty-one million, four hundred sixty thousand, seven hundred twenty-nine".