8137491 has 16 divisors (see below), whose sum is σ = 11481600. Its totient is φ = 5112288.

The previous prime is 8137463. The next prime is 8137501. The reversal of 8137491 is 1947318.

It is not a de Polignac number, because 8137491 - 2¹⁰ = 8136467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8137411) 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, 20725 + ... + 21113.

It is an arithmetic number, because the mean of its divisors is an integer number (717600).

Almost surely, 2^8137491 is an apocalyptic number.

8137491 is a deficient number, since it is larger than the sum of its proper divisors (3344109).

8137491 is a wasteful number, since it uses less digits than its factorization.

8137491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778.

The product of its digits is 6048, while the sum is 33.

The square root of 8137491 is about 2852.6287876273. The cubic root of 8137491 is about 201.1392564846.

The spelling of 8137491 in words is "eight million, one hundred thirty-seven thousand, four hundred ninety-one".