87251251 has 2 divisors, whose sum is σ = 87251252. Its totient is φ = 87251250.

The previous prime is 87251237. The next prime is 87251299. The reversal of 87251251 is 15215278.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87251251 - 2¹³ = 87243059 is a prime.

It is a super-2 number, since 2×87251251² = 15225561602130002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87251221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43625625 + 43625626.

It is an arithmetic number, because the mean of its divisors is an integer number (43625626).

Almost surely, 2^87251251 is an apocalyptic number.

87251251 is a deficient number, since it is larger than the sum of its proper divisors (1).

87251251 is an equidigital number, since it uses as much as digits as its factorization.

87251251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 31.

The square root of 87251251 is about 9340.8378103894. The cubic root of 87251251 is about 443.5309059018.

The spelling of 87251251 in words is "eighty-seven million, two hundred fifty-one thousand, two hundred fifty-one".