721406522831 has 8 divisors (see below), whose sum is σ = 735467058144. Its totient is φ = 707362620640.

The previous prime is 721406522819. The next prime is 721406522843. The reversal of 721406522831 is 138225604127.

It is an interprime number because it is at equal distance from previous prime (721406522819) and next prime (721406522843).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721406522831 is a prime.

It is a super-2 number, since 2×721406522831² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721406522861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4070675 + ... + 4244196.

It is an arithmetic number, because the mean of its divisors is an integer number (91933382268).

Almost surely, 2^721406522831 is an apocalyptic number.

721406522831 is a deficient number, since it is larger than the sum of its proper divisors (14060535313).

721406522831 is a wasteful number, since it uses less digits than its factorization.

721406522831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8316561.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 721406522831 in words is "seven hundred twenty-one billion, four hundred six million, five hundred twenty-two thousand, eight hundred thirty-one".