11561250831 has 16 divisors (see below), whose sum is σ = 16604009856. Its totient is φ = 7113227616.

The previous prime is 11561250829. The next prime is 11561250851. The reversal of 11561250831 is 13805216511.

It is a happy number.

It is not a de Polignac number, because 11561250831 - 2¹ = 11561250829 is a prime.

It is a super-2 number, since 2×11561250831² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11561250792 and 11561250801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561250851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195556 + ... + 247718.

It is an arithmetic number, because the mean of its divisors is an integer number (1037750616).

Almost surely, 2^11561250831 is an apocalyptic number.

11561250831 is a deficient number, since it is larger than the sum of its proper divisors (5042759025).

11561250831 is a wasteful number, since it uses less digits than its factorization.

11561250831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57862.

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 11561250831 in words is "eleven billion, five hundred sixty-one million, two hundred fifty thousand, eight hundred thirty-one".