87155287 has 2 divisors, whose sum is σ = 87155288. Its totient is φ = 87155286.

The previous prime is 87155221. The next prime is 87155293. The reversal of 87155287 is 78255178.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87155287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87155087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43577643 + 43577644.

It is an arithmetic number, because the mean of its divisors is an integer number (43577644).

Almost surely, 2^87155287 is an apocalyptic number.

87155287 is a deficient number, since it is larger than the sum of its proper divisors (1).

87155287 is an equidigital number, since it uses as much as digits as its factorization.

87155287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 43.

The square root of 87155287 is about 9335.6995988517. The cubic root of 87155287 is about 443.3682392225.

The spelling of 87155287 in words is "eighty-seven million, one hundred fifty-five thousand, two hundred eighty-seven".