987249942589 has 2 divisors, whose sum is σ = 987249942590. Its totient is φ = 987249942588.

The previous prime is 987249942577. The next prime is 987249942611. The reversal of 987249942589 is 985249942789.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619943643225 + 367306299364 = 787365^2 + 606058^2 .

It is a cyclic number.

It is not a de Polignac number, because 987249942589 - 2⁵ = 987249942557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987249942689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493624971294 + 493624971295.

It is an arithmetic number, because the mean of its divisors is an integer number (493624971295).

Almost surely, 2^987249942589 is an apocalyptic number.

It is an amenable number.

987249942589 is a deficient number, since it is larger than the sum of its proper divisors (1).

987249942589 is an equidigital number, since it uses as much as digits as its factorization.

987249942589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940584960, while the sum is 76.

The spelling of 987249942589 in words is "nine hundred eighty-seven billion, two hundred forty-nine million, nine hundred forty-two thousand, five hundred eighty-nine".