87224251 has 2 divisors, whose sum is σ = 87224252. Its totient is φ = 87224250.

The previous prime is 87224237. The next prime is 87224299. The reversal of 87224251 is 15242278.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87224251 - 2⁵ = 87224219 is a prime.

It is a super-2 number, since 2×87224251² = 15216139925022002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87224051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43612125 + 43612126.

It is an arithmetic number, because the mean of its divisors is an integer number (43612126).

Almost surely, 2^87224251 is an apocalyptic number.

87224251 is a deficient number, since it is larger than the sum of its proper divisors (1).

87224251 is an equidigital number, since it uses as much as digits as its factorization.

87224251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 31.

The square root of 87224251 is about 9339.3924320590. The cubic root of 87224251 is about 443.4851507988.

The spelling of 87224251 in words is "eighty-seven million, two hundred twenty-four thousand, two hundred fifty-one".