87725173 has 2 divisors, whose sum is σ = 87725174. Its totient is φ = 87725172.

The previous prime is 87725161. The next prime is 87725191. The reversal of 87725173 is 37152778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51940849 + 35784324 = 7207^2 + 5982^2 .

It is a cyclic number.

It is not a de Polignac number, because 87725173 - 2²⁵ = 54170741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87765173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43862586 + 43862587.

It is an arithmetic number, because the mean of its divisors is an integer number (43862587).

Almost surely, 2^87725173 is an apocalyptic number.

It is an amenable number.

87725173 is a deficient number, since it is larger than the sum of its proper divisors (1).

87725173 is an equidigital number, since it uses as much as digits as its factorization.

87725173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 40.

The square root of 87725173 is about 9366.1717366275. The cubic root of 87725173 is about 444.3324975389.

The spelling of 87725173 in words is "eighty-seven million, seven hundred twenty-five thousand, one hundred seventy-three".