87839251 has 2 divisors, whose sum is σ = 87839252. Its totient is φ = 87839250.

The previous prime is 87839249. The next prime is 87839263. The reversal of 87839251 is 15293878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87839251 - 2¹ = 87839249 is a prime.

Together with 87839249, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 87839198 and 87839207.

It is not a weakly prime, because it can be changed into another prime (87839281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43919625 + 43919626.

It is an arithmetic number, because the mean of its divisors is an integer number (43919626).

Almost surely, 2^87839251 is an apocalyptic number.

87839251 is a deficient number, since it is larger than the sum of its proper divisors (1).

87839251 is an equidigital number, since it uses as much as digits as its factorization.

87839251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 87839251 is about 9372.2596528265. The cubic root of 87839251 is about 444.5250177508.

The spelling of 87839251 in words is "eighty-seven million, eight hundred thirty-nine thousand, two hundred fifty-one".