87771589 has 2 divisors, whose sum is σ = 87771590. Its totient is φ = 87771588.

The previous prime is 87771581. The next prime is 87771599. The reversal of 87771589 is 98517778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74390625 + 13380964 = 8625^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 87771589 - 2³ = 87771581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87771581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43885794 + 43885795.

It is an arithmetic number, because the mean of its divisors is an integer number (43885795).

Almost surely, 2^87771589 is an apocalyptic number.

It is an amenable number.

87771589 is a deficient number, since it is larger than the sum of its proper divisors (1).

87771589 is an equidigital number, since it uses as much as digits as its factorization.

87771589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 52.

The square root of 87771589 is about 9368.6492623003. The cubic root of 87771589 is about 444.4108501946.

The spelling of 87771589 in words is "eighty-seven million, seven hundred seventy-one thousand, five hundred eighty-nine".