87117757 has 2 divisors, whose sum is σ = 87117758. Its totient is φ = 87117756.

The previous prime is 87117749. The next prime is 87117763. The reversal of 87117757 is 75771178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85026841 + 2090916 = 9221^2 + 1446^2 .

It is a cyclic number.

It is not a de Polignac number, because 87117757 - 2³ = 87117749 is a prime.

It is a super-2 number, since 2×87117757² = 15179007169422098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87117727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43558878 + 43558879.

It is an arithmetic number, because the mean of its divisors is an integer number (43558879).

Almost surely, 2^87117757 is an apocalyptic number.

It is an amenable number.

87117757 is a deficient number, since it is larger than the sum of its proper divisors (1).

87117757 is an equidigital number, since it uses as much as digits as its factorization.

87117757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96040, while the sum is 43.

The square root of 87117757 is about 9333.6893563049. The cubic root of 87117757 is about 443.3045903816.

The spelling of 87117757 in words is "eighty-seven million, one hundred seventeen thousand, seven hundred fifty-seven".