8137492561 has 8 divisors (see below), whose sum is σ = 9399456864. Its totient is φ = 6962560320.

The previous prime is 8137492549. The next prime is 8137492567. The reversal of 8137492561 is 1652947318.

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 8137492561 - 2²¹ = 8135395409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8137492567) 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, 21757815 + ... + 21758188.

It is an arithmetic number, because the mean of its divisors is an integer number (1174932108).

Almost surely, 2^8137492561 is an apocalyptic number.

It is an amenable number.

8137492561 is a deficient number, since it is larger than the sum of its proper divisors (1261964303).

8137492561 is a wasteful number, since it uses less digits than its factorization.

8137492561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43516031.

The product of its digits is 362880, while the sum is 46.

The square root of 8137492561 is about 90208.0515308916. The cubic root of 8137492561 is about 2011.3926934598.

The spelling of 8137492561 in words is "eight billion, one hundred thirty-seven million, four hundred ninety-two thousand, five hundred sixty-one".