87908969 has 2 divisors, whose sum is σ = 87908970. Its totient is φ = 87908968.

The previous prime is 87908923. The next prime is 87908971. The reversal of 87908969 is 96980978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77668969 + 10240000 = 8813^2 + 3200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87908969 is a prime.

It is a super-2 number, since 2×87908969² = 15455973661285922, which contains 22 as substring.

Together with 87908971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87908069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43954484 + 43954485.

It is an arithmetic number, because the mean of its divisors is an integer number (43954485).

Almost surely, 2^87908969 is an apocalyptic number.

It is an amenable number.

87908969 is a deficient number, since it is larger than the sum of its proper divisors (1).

87908969 is an equidigital number, since it uses as much as digits as its factorization.

87908969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 87908969 is about 9375.9782956233. The cubic root of 87908969 is about 444.6425931291.

The spelling of 87908969 in words is "eighty-seven million, nine hundred eight thousand, nine hundred sixty-nine".