115531919 has 4 divisors (see below), whose sum is σ = 117256344. Its totient is φ = 113807496.

The previous prime is 115531903. The next prime is 115531939. The reversal of 115531919 is 919135511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919135511 = 7 ⋅131305073.

It is a cyclic number.

It is not a de Polignac number, because 115531919 - 2⁴ = 115531903 is a prime.

It is a super-2 number, since 2×115531919² = 26695248615645122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115531939) 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, 862112 + ... + 862245.

It is an arithmetic number, because the mean of its divisors is an integer number (29314086).

Almost surely, 2^115531919 is an apocalyptic number.

115531919 is a deficient number, since it is larger than the sum of its proper divisors (1724425).

115531919 is an equidigital number, since it uses as much as digits as its factorization.

115531919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724424.

The product of its digits is 6075, while the sum is 35.

The square root of 115531919 is about 10748.5775337949. The cubic root of 115531919 is about 487.0430259931.

The spelling of 115531919 in words is "one hundred fifteen million, five hundred thirty-one thousand, nine hundred nineteen".