721675231 has 2 divisors, whose sum is σ = 721675232. Its totient is φ = 721675230.

The previous prime is 721675193. The next prime is 721675259. The reversal of 721675231 is 132576127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721675231 - 2⁷ = 721675103 is a prime.

It is a super-2 number, since 2×721675231² = 1041630278077806722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721675261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360837615 + 360837616.

It is an arithmetic number, because the mean of its divisors is an integer number (360837616).

Almost surely, 2^721675231 is an apocalyptic number.

721675231 is a deficient number, since it is larger than the sum of its proper divisors (1).

721675231 is an equidigital number, since it uses as much as digits as its factorization.

721675231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 34.

The square root of 721675231 is about 26864.0136800144. The cubic root of 721675231 is about 896.9755394193.

The spelling of 721675231 in words is "seven hundred twenty-one million, six hundred seventy-five thousand, two hundred thirty-one".