11231972361 has 9 divisors (see below), whose sum is σ = 16224419341. Its totient is φ = 7487769612.

The previous prime is 11231972351. The next prime is 11231972363. The reversal of 11231972361 is 16327913211.

The square root of 11231972361 is 105981.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-11231972361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11231972363) 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, 300280 + ... + 335606.

Almost surely, 2^11231972361 is an apocalyptic number.

11231972361 is the 105981-st square number.

11231972361 is the 52991-st centered octagonal number.

It is an amenable number.

11231972361 is a deficient number, since it is larger than the sum of its proper divisors (4992446980).

11231972361 is an frugal number, since it uses more digits than its factorization.

11231972361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70660 (or 35330 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

Multiplying 11231972361 by its sum of digits (36), we get a square (404351004996 = 635886²).

The spelling of 11231972361 in words is "eleven billion, two hundred thirty-one million, nine hundred seventy-two thousand, three hundred sixty-one".