115599421 has 4 divisors (see below), whose sum is σ = 132113632. Its totient is φ = 99085212.

The previous prime is 115599397. The next prime is 115599427. The reversal of 115599421 is 124995511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124995511 = 41 ⋅3048671.

It is a cyclic number.

It is not a de Polignac number, because 115599421 - 2⁷ = 115599293 is a prime.

It is a super-2 number, since 2×115599421² = 26726452271070482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115599427) 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, 8257095 + ... + 8257108.

It is an arithmetic number, because the mean of its divisors is an integer number (33028408).

Almost surely, 2^115599421 is an apocalyptic number.

It is an amenable number.

115599421 is a deficient number, since it is larger than the sum of its proper divisors (16514211).

115599421 is an equidigital number, since it uses as much as digits as its factorization.

115599421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16514210.

The product of its digits is 16200, while the sum is 37.

The square root of 115599421 is about 10751.7171186746. The cubic root of 115599421 is about 487.1378626345.

It can be divided in two parts, 1155 and 99421, that added together give a triangular number (100576 = T₄₄₈).

The spelling of 115599421 in words is "one hundred fifteen million, five hundred ninety-nine thousand, four hundred twenty-one".