87170123 has 2 divisors, whose sum is σ = 87170124. Its totient is φ = 87170122.

The previous prime is 87170093. The next prime is 87170147. The reversal of 87170123 is 32107178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87170123 - 2²² = 82975819 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (87170183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43585061 + 43585062.

It is an arithmetic number, because the mean of its divisors is an integer number (43585062).

Almost surely, 2^87170123 is an apocalyptic number.

87170123 is a deficient number, since it is larger than the sum of its proper divisors (1).

87170123 is an equidigital number, since it uses as much as digits as its factorization.

87170123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 87170123 is about 9336.4941493047. The cubic root of 87170123 is about 443.3933952332.

The spelling of 87170123 in words is "eighty-seven million, one hundred seventy thousand, one hundred twenty-three".