87635921 has 2 divisors, whose sum is σ = 87635922. Its totient is φ = 87635920.

The previous prime is 87635909. The next prime is 87635927. The reversal of 87635921 is 12953678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49505296 + 38130625 = 7036^2 + 6175^2 .

It is a cyclic number.

It is not a de Polignac number, because 87635921 - 2¹⁴ = 87619537 is a prime.

It is not a weakly prime, because it can be changed into another prime (87635927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43817960 + 43817961.

It is an arithmetic number, because the mean of its divisors is an integer number (43817961).

Almost surely, 2^87635921 is an apocalyptic number.

It is an amenable number.

87635921 is a deficient number, since it is larger than the sum of its proper divisors (1).

87635921 is an equidigital number, since it uses as much as digits as its factorization.

87635921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 87635921 is about 9361.4059307350. The cubic root of 87635921 is about 444.1817577547.

The spelling of 87635921 in words is "eighty-seven million, six hundred thirty-five thousand, nine hundred twenty-one".