111971903 has 2 divisors, whose sum is σ = 111971904. Its totient is φ = 111971902.

The previous prime is 111971863. The next prime is 111971917. The reversal of 111971903 is 309179111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111971903 - 2⁸ = 111971647 is a prime.

It is a super-2 number, since 2×111971903² = 25075414122882818, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111971903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111971983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55985951 + 55985952.

It is an arithmetic number, because the mean of its divisors is an integer number (55985952).

Almost surely, 2^111971903 is an apocalyptic number.

111971903 is a deficient number, since it is larger than the sum of its proper divisors (1).

111971903 is an equidigital number, since it uses as much as digits as its factorization.

111971903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 32.

The square root of 111971903 is about 10581.6777025196. The cubic root of 111971903 is about 481.9881412692.

The spelling of 111971903 in words is "one hundred eleven million, nine hundred seventy-one thousand, nine hundred three".