87857251 has 2 divisors, whose sum is σ = 87857252. Its totient is φ = 87857250.

The previous prime is 87857233. The next prime is 87857257. The reversal of 87857251 is 15275878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87857251 - 2¹¹ = 87855203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87857198 and 87857207.

It is not a weakly prime, because it can be changed into another prime (87857257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43928625 + 43928626.

It is an arithmetic number, because the mean of its divisors is an integer number (43928626).

Almost surely, 2^87857251 is an apocalyptic number.

87857251 is a deficient number, since it is larger than the sum of its proper divisors (1).

87857251 is an equidigital number, since it uses as much as digits as its factorization.

87857251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156800, while the sum is 43.

The square root of 87857251 is about 9373.2198843300. The cubic root of 87857251 is about 444.5553796666. Note that the first 3 decimals are identical.

The spelling of 87857251 in words is "eighty-seven million, eight hundred fifty-seven thousand, two hundred fifty-one".