115431491 has 4 divisors (see below), whose sum is σ = 131921712. Its totient is φ = 98941272.

The previous prime is 115431473. The next prime is 115431499. The reversal of 115431491 is 194134511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194134511 = 463 ⋅419297.

It is a cyclic number.

It is not a de Polignac number, because 115431491 - 2⁶ = 115431427 is a prime.

It is a super-2 number, since 2×115431491² = 26648858228966162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115431499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8245100 + ... + 8245113.

It is an arithmetic number, because the mean of its divisors is an integer number (32980428).

Almost surely, 2^115431491 is an apocalyptic number.

115431491 is a deficient number, since it is larger than the sum of its proper divisors (16490221).

115431491 is an equidigital number, since it uses as much as digits as its factorization.

115431491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16490220.

The product of its digits is 2160, while the sum is 29.

The square root of 115431491 is about 10743.9048301816. The cubic root of 115431491 is about 486.9018617243.

The spelling of 115431491 in words is "one hundred fifteen million, four hundred thirty-one thousand, four hundred ninety-one".