721467931 has 2 divisors, whose sum is σ = 721467932. Its totient is φ = 721467930.

The previous prime is 721467917. The next prime is 721467973. The reversal of 721467931 is 139764127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721467931 - 2⁵ = 721467899 is a prime.

It is a super-2 number, since 2×721467931² = 1041031950922841522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721467911) 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, 360733965 + 360733966.

It is an arithmetic number, because the mean of its divisors is an integer number (360733966).

Almost surely, 2^721467931 is an apocalyptic number.

721467931 is a deficient number, since it is larger than the sum of its proper divisors (1).

721467931 is an equidigital number, since it uses as much as digits as its factorization.

721467931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 721467931 is about 26860.1550814585. The cubic root of 721467931 is about 896.8896462880.

The spelling of 721467931 in words is "seven hundred twenty-one million, four hundred sixty-seven thousand, nine hundred thirty-one".