118681553 has 4 divisors (see below), whose sum is σ = 118747188. Its totient is φ = 118615920.

The previous prime is 118681517. The next prime is 118681567. The reversal of 118681553 is 355186811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355186811 = 7 ⋅50740973.

It can be written as a sum of positive squares in 2 ways, for example, as 1868689 + 116812864 = 1367^2 + 10808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118681553 is a prime.

It is a super-2 number, since 2×118681553² = 28170622044983618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118683553) 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, 30026 + ... + 33747.

It is an arithmetic number, because the mean of its divisors is an integer number (29686797).

Almost surely, 2^118681553 is an apocalyptic number.

It is an amenable number.

118681553 is a deficient number, since it is larger than the sum of its proper divisors (65635).

118681553 is an equidigital number, since it uses as much as digits as its factorization.

118681553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65634.

The product of its digits is 28800, while the sum is 38.

The square root of 118681553 is about 10894.1063424220. The cubic root of 118681553 is about 491.4293306819.

The spelling of 118681553 in words is "one hundred eighteen million, six hundred eighty-one thousand, five hundred fifty-three".