118478257531 has 4 divisors (see below), whose sum is σ = 119232896272. Its totient is φ = 117723618792.

The previous prime is 118478257529. The next prime is 118478257561. The reversal of 118478257531 is 135752874811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135752874811 = 151 ⋅899025661.

It is a cyclic number.

It is not a de Polignac number, because 118478257531 - 2¹ = 118478257529 is a prime.

It is a super-2 number, since 2×118478257531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118478257561) 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, 377319135 + ... + 377319448.

It is an arithmetic number, because the mean of its divisors is an integer number (29808224068).

Almost surely, 2^118478257531 is an apocalyptic number.

118478257531 is a deficient number, since it is larger than the sum of its proper divisors (754638741).

118478257531 is an equidigital number, since it uses as much as digits as its factorization.

118478257531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754638740.

The product of its digits is 1881600, while the sum is 52.

The spelling of 118478257531 in words is "one hundred eighteen billion, four hundred seventy-eight million, two hundred fifty-seven thousand, five hundred thirty-one".