87957391 has 2 divisors, whose sum is σ = 87957392. Its totient is φ = 87957390.

The previous prime is 87957383. The next prime is 87957407. The reversal of 87957391 is 19375978.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87957391 - 2³ = 87957383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87957361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43978695 + 43978696.

It is an arithmetic number, because the mean of its divisors is an integer number (43978696).

Almost surely, 2^87957391 is an apocalyptic number.

87957391 is a deficient number, since it is larger than the sum of its proper divisors (1).

87957391 is an equidigital number, since it uses as much as digits as its factorization.

87957391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 87957391 is about 9378.5601773407. The cubic root of 87957391 is about 444.7242174577.

The spelling of 87957391 in words is "eighty-seven million, nine hundred fifty-seven thousand, three hundred ninety-one".