110311991 has 2 divisors, whose sum is σ = 110311992. Its totient is φ = 110311990.

The previous prime is 110311951. The next prime is 110312003. The reversal of 110311991 is 199113011.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-110311991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 110311991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110311951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55155995 + 55155996.

It is an arithmetic number, because the mean of its divisors is an integer number (55155996).

Almost surely, 2^110311991 is an apocalyptic number.

110311991 is a deficient number, since it is larger than the sum of its proper divisors (1).

110311991 is an equidigital number, since it uses as much as digits as its factorization.

110311991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 26.

The square root of 110311991 is about 10502.9515375441. The cubic root of 110311991 is about 479.5945520078.

The spelling of 110311991 in words is "one hundred ten million, three hundred eleven thousand, nine hundred ninety-one".