87916813 has 2 divisors, whose sum is σ = 87916814. Its totient is φ = 87916812.

The previous prime is 87916769. The next prime is 87916859. The reversal of 87916813 is 31861978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53846244 + 34070569 = 7338^2 + 5837^2 .

It is a cyclic number.

It is not a de Polignac number, because 87916813 - 2¹³ = 87908621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87916813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87976813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43958406 + 43958407.

It is an arithmetic number, because the mean of its divisors is an integer number (43958407).

Almost surely, 2^87916813 is an apocalyptic number.

It is an amenable number.

87916813 is a deficient number, since it is larger than the sum of its proper divisors (1).

87916813 is an equidigital number, since it uses as much as digits as its factorization.

87916813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 87916813 is about 9376.3965893087. The cubic root of 87916813 is about 444.6558176909.

The spelling of 87916813 in words is "eighty-seven million, nine hundred sixteen thousand, eight hundred thirteen".