87116251 has 2 divisors, whose sum is σ = 87116252. Its totient is φ = 87116250.

The previous prime is 87116233. The next prime is 87116287. The reversal of 87116251 is 15261178.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87116251 - 2⁷ = 87116123 is a prime.

It is not a weakly prime, because it can be changed into another prime (87116291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43558125 + 43558126.

It is an arithmetic number, because the mean of its divisors is an integer number (43558126).

Almost surely, 2^87116251 is an apocalyptic number.

87116251 is a deficient number, since it is larger than the sum of its proper divisors (1).

87116251 is an equidigital number, since it uses as much as digits as its factorization.

87116251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 31.

The square root of 87116251 is about 9333.6086804622. The cubic root of 87116251 is about 443.3020359059.

The spelling of 87116251 in words is "eighty-seven million, one hundred sixteen thousand, two hundred fifty-one".