1181920113 has 32 divisors (see below), whose sum is σ = 1993236480. Its totient is φ = 685167120.

The previous prime is 1181920111. The next prime is 1181920123. The reversal of 1181920113 is 3110291811.

It is not a de Polignac number, because 1181920113 - 2¹ = 1181920111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1181920111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79681 + ... + 93342.

It is an arithmetic number, because the mean of its divisors is an integer number (62288640).

Almost surely, 2^1181920113 is an apocalyptic number.

It is an amenable number.

1181920113 is a deficient number, since it is larger than the sum of its proper divisors (811316367).

1181920113 is a wasteful number, since it uses less digits than its factorization.

1181920113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173066 (or 173060 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 1181920113 is about 34379.0650396429. The cubic root of 1181920113 is about 1057.2946656306.

The spelling of 1181920113 in words is "one billion, one hundred eighty-one million, nine hundred twenty thousand, one hundred thirteen".