87477251 has 4 divisors (see below), whose sum is σ = 87633192. Its totient is φ = 87321312.

The previous prime is 87477241. The next prime is 87477307. The reversal of 87477251 is 15277478.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87477251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87477199 and 87477208.

It is not an unprimeable number, because it can be changed into a prime (87477241) 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, 77126 + ... + 78251.

It is an arithmetic number, because the mean of its divisors is an integer number (21908298).

Almost surely, 2^87477251 is an apocalyptic number.

87477251 is a deficient number, since it is larger than the sum of its proper divisors (155941).

87477251 is a wasteful number, since it uses less digits than its factorization.

87477251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155940.

The product of its digits is 109760, while the sum is 41.

The square root of 87477251 is about 9352.9274026906. The cubic root of 87477251 is about 443.9135233877.

It can be divided in two parts, 874 and 77251, that added together give a 7-th power (78125 = 5⁷).

The spelling of 87477251 in words is "eighty-seven million, four hundred seventy-seven thousand, two hundred fifty-one".