591697869961 has 9 divisors (see below), whose sum is σ = 650387951143. Its totient is φ = 537899462320.

The previous prime is 591697869949. The next prime is 591697869967. The reversal of 591697869961 is 169968796195.

The square root of 591697869961 is 769219.

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

591697869961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12272429961 + 579425440000 = 110781^2 + 761200^2 .

It is not a de Polignac number, because 591697869961 - 2⁹ = 591697869449 is a prime.

It is a super-2 number, since 2×591697869961² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (591697869967) 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, 8426445 + ... + 8496373.

Almost surely, 2^591697869961 is an apocalyptic number.

591697869961 is the 769219-th square number.

591697869961 is the 384610-th centered octagonal number.

It is an amenable number.

591697869961 is a deficient number, since it is larger than the sum of its proper divisors (58690081182).

591697869961 is an frugal number, since it uses more digits than its factorization.

591697869961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139880 (or 69940 counting only the distinct ones).

The product of its digits is 396809280, while the sum is 76.

The spelling of 591697869961 in words is "five hundred ninety-one billion, six hundred ninety-seven million, eight hundred sixty-nine thousand, nine hundred sixty-one".