981875491 has 2 divisors, whose sum is σ = 981875492. Its totient is φ = 981875490.

The previous prime is 981875429. The next prime is 981875551. The reversal of 981875491 is 194578189.

981875491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981875491 is a prime.

It is not a weakly prime, because it can be changed into another prime (981875891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490937745 + 490937746.

It is an arithmetic number, because the mean of its divisors is an integer number (490937746).

Almost surely, 2^981875491 is an apocalyptic number.

981875491 is a deficient number, since it is larger than the sum of its proper divisors (1).

981875491 is an equidigital number, since it uses as much as digits as its factorization.

981875491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 52.

The square root of 981875491 is about 31334.8925480845. The cubic root of 981875491 is about 993.9216252185.

The spelling of 981875491 in words is "nine hundred eighty-one million, eight hundred seventy-five thousand, four hundred ninety-one".