118972491 has 16 divisors (see below), whose sum is σ = 180576000. Its totient is φ = 68969120.

The previous prime is 118972417. The next prime is 118972517. The reversal of 118972491 is 194279811.

It is not a de Polignac number, because 118972491 - 2¹⁰ = 118971467 is a prime.

It is a super-2 number, since 2×118972491² = 28308907229490162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (118972291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77616 + ... + 79133.

It is an arithmetic number, because the mean of its divisors is an integer number (11286000).

Almost surely, 2^118972491 is an apocalyptic number.

118972491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

118972491 is a deficient number, since it is larger than the sum of its proper divisors (61603509).

118972491 is a wasteful number, since it uses less digits than its factorization.

118972491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156786.

The product of its digits is 36288, while the sum is 42.

The square root of 118972491 is about 10907.4511688112. The cubic root of 118972491 is about 491.8305690969.

The spelling of 118972491 in words is "one hundred eighteen million, nine hundred seventy-two thousand, four hundred ninety-one".