115491139 has 4 divisors (see below), whose sum is σ = 121569640. Its totient is φ = 109412640.

The previous prime is 115491121. The next prime is 115491157. The reversal of 115491139 is 931194511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931194511 = 13 ⋅71630347.

It is an interprime number because it is at equal distance from previous prime (115491121) and next prime (115491157).

It is not a de Polignac number, because 115491139 - 2⁵ = 115491107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115491109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3039222 + ... + 3039259.

It is an arithmetic number, because the mean of its divisors is an integer number (30392410).

Almost surely, 2^115491139 is an apocalyptic number.

115491139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

115491139 is a deficient number, since it is larger than the sum of its proper divisors (6078501).

115491139 is an equidigital number, since it uses as much as digits as its factorization.

115491139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078500.

The product of its digits is 4860, while the sum is 34.

The square root of 115491139 is about 10746.6803711658. The cubic root of 115491139 is about 486.9857144088.

The spelling of 115491139 in words is "one hundred fifteen million, four hundred ninety-one thousand, one hundred thirty-nine".