87171557 has 8 divisors (see below), whose sum is σ = 95180160. Its totient is φ = 79176960.

The previous prime is 87171527. The next prime is 87171559. The reversal of 87171557 is 75517178.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87171557 - 2⁶ = 87171493 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 (87171559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12869 + ... + 18437.

It is an arithmetic number, because the mean of its divisors is an integer number (11897520).

Almost surely, 2^87171557 is an apocalyptic number.

It is an amenable number.

87171557 is a deficient number, since it is larger than the sum of its proper divisors (8008603).

87171557 is a wasteful number, since it uses less digits than its factorization.

87171557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003.

The product of its digits is 68600, while the sum is 41.

The square root of 87171557 is about 9336.5709444099. The cubic root of 87171557 is about 443.3958265809.

The spelling of 87171557 in words is "eighty-seven million, one hundred seventy-one thousand, five hundred fifty-seven".