87510991 has 2 divisors, whose sum is σ = 87510992. Its totient is φ = 87510990.

The previous prime is 87510953. The next prime is 87511007. The reversal of 87510991 is 19901578.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87510991 - 2¹³ = 87502799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87510191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43755495 + 43755496.

It is an arithmetic number, because the mean of its divisors is an integer number (43755496).

Almost surely, 2^87510991 is an apocalyptic number.

87510991 is a deficient number, since it is larger than the sum of its proper divisors (1).

87510991 is an equidigital number, since it uses as much as digits as its factorization.

87510991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 87510991 is about 9354.7309421490. The cubic root of 87510991 is about 443.9705885747.

The spelling of 87510991 in words is "eighty-seven million, five hundred ten thousand, nine hundred ninety-one".