87127517 has 2 divisors, whose sum is σ = 87127518. Its totient is φ = 87127516.

The previous prime is 87127487. The next prime is 87127531. The reversal of 87127517 is 71572178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64336441 + 22791076 = 8021^2 + 4774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87127517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87127717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43563758 + 43563759.

It is an arithmetic number, because the mean of its divisors is an integer number (43563759).

Almost surely, 2^87127517 is an apocalyptic number.

It is an amenable number.

87127517 is a deficient number, since it is larger than the sum of its proper divisors (1).

87127517 is an equidigital number, since it uses as much as digits as its factorization.

87127517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27440, while the sum is 38.

The square root of 87127517 is about 9334.2121788612. The cubic root of 87127517 is about 443.3211445698.

The spelling of 87127517 in words is "eighty-seven million, one hundred twenty-seven thousand, five hundred seventeen".