731465921 has 2 divisors, whose sum is σ = 731465922. Its totient is φ = 731465920.

The previous prime is 731465899. The next prime is 731465929. The reversal of 731465921 is 129564137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616975921 + 114490000 = 24839^2 + 10700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731465921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (731465929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365732960 + 365732961.

It is an arithmetic number, because the mean of its divisors is an integer number (365732961).

Almost surely, 2^731465921 is an apocalyptic number.

It is an amenable number.

731465921 is a deficient number, since it is larger than the sum of its proper divisors (1).

731465921 is an equidigital number, since it uses as much as digits as its factorization.

731465921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 731465921 is about 27045.6266520116. The cubic root of 731465921 is about 901.0136402464.

The spelling of 731465921 in words is "seven hundred thirty-one million, four hundred sixty-five thousand, nine hundred twenty-one".