87645121 has 2 divisors, whose sum is σ = 87645122. Its totient is φ = 87645120.

The previous prime is 87645101. The next prime is 87645133. The reversal of 87645121 is 12154678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76755121 + 10890000 = 8761^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 87645121 - 2⁷ = 87644993 is a prime.

It is not a weakly prime, because it can be changed into another prime (87645101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43822560 + 43822561.

It is an arithmetic number, because the mean of its divisors is an integer number (43822561).

Almost surely, 2^87645121 is an apocalyptic number.

It is an amenable number.

87645121 is a deficient number, since it is larger than the sum of its proper divisors (1).

87645121 is an equidigital number, since it uses as much as digits as its factorization.

87645121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 87645121 is about 9361.8972970226. The cubic root of 87645121 is about 444.1973005791.

Adding to 87645121 its reverse (12154678), we get a palindrome (99799799).

The spelling of 87645121 in words is "eighty-seven million, six hundred forty-five thousand, one hundred twenty-one".