1131097815831 has 8 divisors (see below), whose sum is σ = 1508165203824. Its totient is φ = 754047819200.

The previous prime is 1131097815779. The next prime is 1131097815871. The reversal of 1131097815831 is 1385187901311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131097815831 is a prime.

It is a super-2 number, since 2×1131097815831² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131097815871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4195320 + ... + 4456781.

It is an arithmetic number, because the mean of its divisors is an integer number (188520650478).

Almost surely, 2^{1131097815831} is an apocalyptic number.

1131097815831 is a deficient number, since it is larger than the sum of its proper divisors (377067387993).

1131097815831 is an equidigital number, since it uses as much as digits as its factorization.

1131097815831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8695681.

The product of its (nonzero) digits is 181440, while the sum is 48.

The spelling of 1131097815831 in words is "one trillion, one hundred thirty-one billion, ninety-seven million, eight hundred fifteen thousand, eight hundred thirty-one".