87401591 has 2 divisors, whose sum is σ = 87401592. Its totient is φ = 87401590.

The previous prime is 87401581. The next prime is 87401599. The reversal of 87401591 is 19510478.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87401591 - 2¹⁸ = 87139447 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87401599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43700795 + 43700796.

It is an arithmetic number, because the mean of its divisors is an integer number (43700796).

Almost surely, 2^87401591 is an apocalyptic number.

87401591 is a deficient number, since it is larger than the sum of its proper divisors (1).

87401591 is an equidigital number, since it uses as much as digits as its factorization.

87401591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 87401591 is about 9348.8818047936. The cubic root of 87401591 is about 443.7855046379.

The spelling of 87401591 in words is "eighty-seven million, four hundred one thousand, five hundred ninety-one".