87981287 has 2 divisors, whose sum is σ = 87981288. Its totient is φ = 87981286.

The previous prime is 87981281. The next prime is 87981293. The reversal of 87981287 is 78218978.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (87981281) and next prime (87981293).

It is a cyclic number.

It is not a de Polignac number, because 87981287 - 2²⁴ = 71204071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87981281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43990643 + 43990644.

It is an arithmetic number, because the mean of its divisors is an integer number (43990644).

Almost surely, 2^87981287 is an apocalyptic number.

87981287 is a deficient number, since it is larger than the sum of its proper divisors (1).

87981287 is an equidigital number, since it uses as much as digits as its factorization.

87981287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 50.

The square root of 87981287 is about 9379.8340603659. The cubic root of 87981287 is about 444.7644875913.

The spelling of 87981287 in words is "eighty-seven million, nine hundred eighty-one thousand, two hundred eighty-seven".