719902561 has 9 divisors (see below), whose sum is σ = 837656211. Its totient is φ = 616898352.

The previous prime is 719902543. The next prime is 719902627. The reversal of 719902561 is 165209917.

The square root of 719902561 is 26831.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 156125025 + 563777536 = 12495^2 + 23744^2 .

It is not a de Polignac number, because 719902561 - 2⁵ = 719902529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (719902501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 185901 + ... + 189733.

Almost surely, 2^719902561 is an apocalyptic number.

719902561 is the 26831-st square number.

719902561 is the 13416-th centered octagonal number.

It is an amenable number.

719902561 is a deficient number, since it is larger than the sum of its proper divisors (117753650).

719902561 is an frugal number, since it uses more digits than its factorization.

719902561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680 (or 3840 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 40.

The cubic root of 719902561 is about 896.2405156728.

The spelling of 719902561 in words is "seven hundred nineteen million, nine hundred two thousand, five hundred sixty-one".