87801251 has 2 divisors, whose sum is σ = 87801252. Its totient is φ = 87801250.

The previous prime is 87801247. The next prime is 87801253. The reversal of 87801251 is 15210878.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87801251 - 2² = 87801247 is a prime.

Together with 87801253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87801253) 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 as a sum of consecutive naturals, namely, 43900625 + 43900626.

It is an arithmetic number, because the mean of its divisors is an integer number (43900626).

Almost surely, 2^87801251 is an apocalyptic number.

87801251 is a deficient number, since it is larger than the sum of its proper divisors (1).

87801251 is an equidigital number, since it uses as much as digits as its factorization.

87801251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 87801251 is about 9370.2321742847. The cubic root of 87801251 is about 444.4609067490.

The spelling of 87801251 in words is "eighty-seven million, eight hundred one thousand, two hundred fifty-one".