118197819431 has 4 divisors (see below), whose sum is σ = 120135488664. Its totient is φ = 116260150200.

The previous prime is 118197819409. The next prime is 118197819463. The reversal of 118197819431 is 134918791811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 118197819431 - 2¹⁰ = 118197818407 is a prime.

It is a super-2 number, since 2×118197819431² (a number of 23 digits) 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 (118197819031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968834525 + ... + 968834646.

It is an arithmetic number, because the mean of its divisors is an integer number (30033872166).

Almost surely, 2^118197819431 is an apocalyptic number.

118197819431 is a deficient number, since it is larger than the sum of its proper divisors (1937669233).

118197819431 is an equidigital number, since it uses as much as digits as its factorization.

118197819431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937669232.

The product of its digits is 435456, while the sum is 53.

The spelling of 118197819431 in words is "one hundred eighteen billion, one hundred ninety-seven million, eight hundred nineteen thousand, four hundred thirty-one".