87999413 has 2 divisors, whose sum is σ = 87999414. Its totient is φ = 87999412.

The previous prime is 87999409. The next prime is 87999419. The reversal of 87999413 is 31499978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70174129 + 17825284 = 8377^2 + 4222^2 .

It is a cyclic number.

It is not a de Polignac number, because 87999413 - 2² = 87999409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87999419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43999706 + 43999707.

It is an arithmetic number, because the mean of its divisors is an integer number (43999707).

Almost surely, 2^87999413 is an apocalyptic number.

It is an amenable number.

87999413 is a deficient number, since it is larger than the sum of its proper divisors (1).

87999413 is an equidigital number, since it uses as much as digits as its factorization.

87999413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 87999413 is about 9380.8002323896. The cubic root of 87999413 is about 444.7950291145.

The spelling of 87999413 in words is "eighty-seven million, nine hundred ninety-nine thousand, four hundred thirteen".