87212051 has 4 divisors (see below), whose sum is σ = 87342312. Its totient is φ = 87081792.

The previous prime is 87212017. The next prime is 87212053. The reversal of 87212051 is 15021278.

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 87212051 - 2²² = 83017747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87212051.

It is not an unprimeable number, because it can be changed into a prime (87212053) 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, 64121 + ... + 65466.

It is an arithmetic number, because the mean of its divisors is an integer number (21835578).

Almost surely, 2^87212051 is an apocalyptic number.

87212051 is a deficient number, since it is larger than the sum of its proper divisors (130261).

87212051 is a wasteful number, since it uses less digits than its factorization.

87212051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130260.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 87212051 is about 9338.7392618062. The cubic root of 87212051 is about 443.4644731736.

The spelling of 87212051 in words is "eighty-seven million, two hundred twelve thousand, fifty-one".