87812551 has 16 divisors (see below), whose sum is σ = 95463360. Its totient is φ = 80523520.

The previous prime is 87812533. The next prime is 87812561. The reversal of 87812551 is 15521878.

It is a cyclic number.

It is not a de Polignac number, because 87812551 - 2⁵ = 87812519 is a prime.

It is a super-2 number, since 2×87812551² = 15422088226255202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87812551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87812521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115011 + ... + 115771.

It is an arithmetic number, because the mean of its divisors is an integer number (5966460).

Almost surely, 2^87812551 is an apocalyptic number.

87812551 is a deficient number, since it is larger than the sum of its proper divisors (7650809).

87812551 is a wasteful number, since it uses less digits than its factorization.

87812551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986.

The product of its digits is 22400, while the sum is 37.

The square root of 87812551 is about 9370.8351282050. The cubic root of 87812551 is about 444.4799732686.

The spelling of 87812551 in words is "eighty-seven million, eight hundred twelve thousand, five hundred fifty-one".