118125581 has 4 divisors (see below), whose sum is σ = 135000672. Its totient is φ = 101250492.

The previous prime is 118125563. The next prime is 118125599. The reversal of 118125581 is 185521811.

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: 185521811 = 37 ⋅5014103.

It is an interprime number because it is at equal distance from previous prime (118125563) and next prime (118125599).

It is not a de Polignac number, because 118125581 - 2¹⁸ = 117863437 is a prime.

It is a super-2 number, since 2×118125581² = 27907305773175122, 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 (118125521) 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, 8437535 + ... + 8437548.

It is an arithmetic number, because the mean of its divisors is an integer number (33750168).

Almost surely, 2^118125581 is an apocalyptic number.

It is an amenable number.

118125581 is a deficient number, since it is larger than the sum of its proper divisors (16875091).

118125581 is an equidigital number, since it uses as much as digits as its factorization.

118125581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16875090.

The product of its digits is 3200, while the sum is 32.

The square root of 118125581 is about 10868.5592881485. The cubic root of 118125581 is about 490.6607509670.

It can be divided in two parts, 1181 and 25581, that added together give a palindrome (26762).

The spelling of 118125581 in words is "one hundred eighteen million, one hundred twenty-five thousand, five hundred eighty-one".