111890431 has 2 divisors, whose sum is σ = 111890432. Its totient is φ = 111890430.

The previous prime is 111890393. The next prime is 111890437. The reversal of 111890431 is 134098111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111890431 - 2⁹ = 111889919 is a prime.

It is a super-2 number, since 2×111890431² = 25038937098731522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111890431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111890437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55945215 + 55945216.

It is an arithmetic number, because the mean of its divisors is an integer number (55945216).

Almost surely, 2^111890431 is an apocalyptic number.

111890431 is a deficient number, since it is larger than the sum of its proper divisors (1).

111890431 is an equidigital number, since it uses as much as digits as its factorization.

111890431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 111890431 is about 10577.8273288989. The cubic root of 111890431 is about 481.8712129305.

The spelling of 111890431 in words is "one hundred eleven million, eight hundred ninety thousand, four hundred thirty-one".