1231534681761 has 8 divisors (see below), whose sum is σ = 1657392469344. Its totient is φ = 813350007680.

The previous prime is 1231534681757. The next prime is 1231534681763. The reversal of 1231534681761 is 1671864351321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231534681761 - 2² = 1231534681757 is a prime.

It is a super-2 number, since 2×1231534681761² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231534681761.

It is not an unprimeable number, because it can be changed into a prime (1231534681763) 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, 1918278000 + ... + 1918278641.

It is an arithmetic number, because the mean of its divisors is an integer number (207174058668).

Almost surely, 2^{1231534681761} is an apocalyptic number.

It is an amenable number.

1231534681761 is a deficient number, since it is larger than the sum of its proper divisors (425857787583).

1231534681761 is a wasteful number, since it uses less digits than its factorization.

1231534681761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836556751.

The product of its digits is 725760, while the sum is 48.

The spelling of 1231534681761 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-four million, six hundred eighty-one thousand, seven hundred sixty-one".