721074925 has 6 divisors (see below), whose sum is σ = 894132938. Its totient is φ = 576859920.

The previous prime is 721074919. The next prime is 721074929. The reversal of 721074925 is 529470127.

It can be written as a sum of positive squares in 3 ways, for example, as 39917124 + 681157801 = 6318^2 + 26099^2 .

It is not a de Polignac number, because 721074925 - 2⁷ = 721074797 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721074929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14421474 + ... + 14421523.

Almost surely, 2^721074925 is an apocalyptic number.

It is an amenable number.

721074925 is a deficient number, since it is larger than the sum of its proper divisors (173058013).

721074925 is a wasteful number, since it uses less digits than its factorization.

721074925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28843007 (or 28843002 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 721074925 is about 26852.8383043581. The cubic root of 721074925 is about 896.7267621554.

The spelling of 721074925 in words is "seven hundred twenty-one million, seventy-four thousand, nine hundred twenty-five".