113181978 has 32 divisors (see below), whose sum is σ = 278603136. Its totient is φ = 29850048.

The previous prime is 113181967. The next prime is 113181989. The reversal of 113181978 is 879181311.

It is an interprime number because it is at equal distance from previous prime (113181967) and next prime (113181989).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103101 + ... + 104192.

It is an arithmetic number, because the mean of its divisors is an integer number (8706348).

Almost surely, 2^113181978 is an apocalyptic number.

113181978 is an abundant number, since it is smaller than the sum of its proper divisors (165421158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

113181978 is a wasteful number, since it uses less digits than its factorization.

113181978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207318.

The product of its digits is 12096, while the sum is 39.

The square root of 113181978 is about 10638.7018944982. The cubic root of 113181978 is about 483.7181982045.

The spelling of 113181978 in words is "one hundred thirteen million, one hundred eighty-one thousand, nine hundred seventy-eight".