87117501 has 4 divisors (see below), whose sum is σ = 116156672. Its totient is φ = 58078332.

The previous prime is 87117467. The next prime is 87117509. The reversal of 87117501 is 10571178.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87117501 - 2¹¹ = 87115453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87117509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14519581 + ... + 14519586.

It is an arithmetic number, because the mean of its divisors is an integer number (29039168).

Almost surely, 2^87117501 is an apocalyptic number.

It is an amenable number.

87117501 is a deficient number, since it is larger than the sum of its proper divisors (29039171).

87117501 is a wasteful number, since it uses less digits than its factorization.

87117501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29039170.

The product of its (nonzero) digits is 1960, while the sum is 30.

The square root of 87117501 is about 9333.6756425323. The cubic root of 87117501 is about 443.3041561567.

Adding to 87117501 its reverse (10571178), we get a palindrome (97688679).

The spelling of 87117501 in words is "eighty-seven million, one hundred seventeen thousand, five hundred one".