87251071 has 4 divisors (see below), whose sum is σ = 87313392. Its totient is φ = 87188752.

The previous prime is 87251057. The next prime is 87251107. The reversal of 87251071 is 17015278.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87251071 - 2²⁵ = 53696639 is a prime.

It is a super-2 number, since 2×87251071² = 15225498781294082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87251051) 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, 29011 + ... + 31876.

It is an arithmetic number, because the mean of its divisors is an integer number (21828348).

Almost surely, 2^87251071 is an apocalyptic number.

87251071 is a deficient number, since it is larger than the sum of its proper divisors (62321).

87251071 is a wasteful number, since it uses less digits than its factorization.

87251071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62320.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 87251071 is about 9340.8281752744. The cubic root of 87251071 is about 443.5306008991.

The spelling of 87251071 in words is "eighty-seven million, two hundred fifty-one thousand, seventy-one".