721954931 has 2 divisors, whose sum is σ = 721954932. Its totient is φ = 721954930.

The previous prime is 721954903. The next prime is 721954943. The reversal of 721954931 is 139459127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721954931 - 2⁶ = 721954867 is a prime.

It is a super-2 number, since 2×721954931² = 1042437844790429522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721954531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360977465 + 360977466.

It is an arithmetic number, because the mean of its divisors is an integer number (360977466).

Almost surely, 2^721954931 is an apocalyptic number.

721954931 is a deficient number, since it is larger than the sum of its proper divisors (1).

721954931 is an equidigital number, since it uses as much as digits as its factorization.

721954931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 721954931 is about 26869.2190247502. The cubic root of 721954931 is about 897.0914048589.

The spelling of 721954931 in words is "seven hundred twenty-one million, nine hundred fifty-four thousand, nine hundred thirty-one".