87251551 has 4 divisors (see below), whose sum is σ = 87879400. Its totient is φ = 86623704.

The previous prime is 87251543. The next prime is 87251603. The reversal of 87251551 is 15515278.

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 87251551 - 2³ = 87251543 is a prime.

It is a super-2 number, since 2×87251551² = 15225666303811202, 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, 313716 + ... + 313993.

It is an arithmetic number, because the mean of its divisors is an integer number (21969850).

Almost surely, 2^87251551 is an apocalyptic number.

87251551 is a deficient number, since it is larger than the sum of its proper divisors (627849).

87251551 is a wasteful number, since it uses less digits than its factorization.

87251551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627848.

The product of its digits is 14000, while the sum is 34.

The square root of 87251551 is about 9340.8538688923. The cubic root of 87251551 is about 443.5314142388.

The spelling of 87251551 in words is "eighty-seven million, two hundred fifty-one thousand, five hundred fifty-one".