731487409 has 2 divisors, whose sum is σ = 731487410. Its totient is φ = 731487408.

The previous prime is 731487401. The next prime is 731487433. The reversal of 731487409 is 904784137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662547600 + 68939809 = 25740^2 + 8303^2 .

It is a cyclic number.

It is not a de Polignac number, because 731487409 - 2³ = 731487401 is a prime.

It is not a weakly prime, because it can be changed into another prime (731487401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365743704 + 365743705.

It is an arithmetic number, because the mean of its divisors is an integer number (365743705).

Almost surely, 2^731487409 is an apocalyptic number.

It is an amenable number.

731487409 is a deficient number, since it is larger than the sum of its proper divisors (1).

731487409 is an equidigital number, since it uses as much as digits as its factorization.

731487409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 731487409 is about 27046.0239037090. The cubic root of 731487409 is about 901.0224630733.

The spelling of 731487409 in words is "seven hundred thirty-one million, four hundred eighty-seven thousand, four hundred nine".