87774917 has 2 divisors, whose sum is σ = 87774918. Its totient is φ = 87774916.

The previous prime is 87774887. The next prime is 87774983. The reversal of 87774917 is 71947778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56761156 + 31013761 = 7534^2 + 5569^2 .

It is a cyclic number.

It is not a de Polignac number, because 87774917 - 2⁶ = 87774853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87774017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43887458 + 43887459.

It is an arithmetic number, because the mean of its divisors is an integer number (43887459).

Almost surely, 2^87774917 is an apocalyptic number.

It is an amenable number.

87774917 is a deficient number, since it is larger than the sum of its proper divisors (1).

87774917 is an equidigital number, since it uses as much as digits as its factorization.

87774917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691488, while the sum is 50.

The square root of 87774917 is about 9368.8268742677. The cubic root of 87774917 is about 444.4164669727.

The spelling of 87774917 in words is "eighty-seven million, seven hundred seventy-four thousand, nine hundred seventeen".