111978151 has 2 divisors, whose sum is σ = 111978152. Its totient is φ = 111978150.

The previous prime is 111978137. The next prime is 111978157. The reversal of 111978151 is 151879111.

It is a strong prime.

It is an emirp because it is prime and its reverse (151879111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111978151 - 2¹³ = 111969959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111978157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55989075 + 55989076.

It is an arithmetic number, because the mean of its divisors is an integer number (55989076).

Almost surely, 2^111978151 is an apocalyptic number.

111978151 is a deficient number, since it is larger than the sum of its proper divisors (1).

111978151 is an equidigital number, since it uses as much as digits as its factorization.

111978151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 34.

The square root of 111978151 is about 10581.9729256883. The cubic root of 111978151 is about 481.9971060357.

The spelling of 111978151 in words is "one hundred eleven million, nine hundred seventy-eight thousand, one hundred fifty-one".