87251539 has 2 divisors, whose sum is σ = 87251540. Its totient is φ = 87251538.

The previous prime is 87251537. The next prime is 87251543. The reversal of 87251539 is 93515278.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87251539 - 2¹ = 87251537 is a prime.

It is a super-2 number, since 2×87251539² = 15225662115737042, which contains 22 as substring.

Together with 87251537, it forms a pair of twin primes.

It is equal to p_5066959 and since 87251539 and 5066959 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (87251537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43625769 + 43625770.

It is an arithmetic number, because the mean of its divisors is an integer number (43625770).

Almost surely, 2^87251539 is an apocalyptic number.

87251539 is a deficient number, since it is larger than the sum of its proper divisors (1).

87251539 is an equidigital number, since it uses as much as digits as its factorization.

87251539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 87251539 is about 9340.8532265527. The cubic root of 87251539 is about 443.5313939054.

The spelling of 87251539 in words is "eighty-seven million, two hundred fifty-one thousand, five hundred thirty-nine".