87881489 has 2 divisors, whose sum is σ = 87881490. Its totient is φ = 87881488.

The previous prime is 87881471. The next prime is 87881501. The reversal of 87881489 is 98418878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78021889 + 9859600 = 8833^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 87881489 - 2²⁴ = 71104273 is a prime.

It is a super-2 number, since 2×87881489² = 15446312217714242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87881489.

It is not a weakly prime, because it can be changed into another prime (87881389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43940744 + 43940745.

It is an arithmetic number, because the mean of its divisors is an integer number (43940745).

Almost surely, 2^87881489 is an apocalyptic number.

It is an amenable number.

87881489 is a deficient number, since it is larger than the sum of its proper divisors (1).

87881489 is an equidigital number, since it uses as much as digits as its factorization.

87881489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1032192, while the sum is 53.

The square root of 87881489 is about 9374.5127340038. The cubic root of 87881489 is about 444.5962571219.

The spelling of 87881489 in words is "eighty-seven million, eight hundred eighty-one thousand, four hundred eighty-nine".