11820572731 has 4 divisors (see below), whose sum is σ = 12895170264. Its totient is φ = 10745975200.

The previous prime is 11820572723. The next prime is 11820572767. The reversal of 11820572731 is 13727502811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11820572731 - 2³ = 11820572723 is a prime.

It is a super-2 number, since 2×11820572731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11820570731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537298750 + ... + 537298771.

It is an arithmetic number, because the mean of its divisors is an integer number (3223792566).

Almost surely, 2^11820572731 is an apocalyptic number.

11820572731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11820572731 is a deficient number, since it is larger than the sum of its proper divisors (1074597533).

11820572731 is a wasteful number, since it uses less digits than its factorization.

11820572731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074597532.

The product of its (nonzero) digits is 23520, while the sum is 37.

The spelling of 11820572731 in words is "eleven billion, eight hundred twenty million, five hundred seventy-two thousand, seven hundred thirty-one".