998951587 has 2 divisors, whose sum is σ = 998951588. Its totient is φ = 998951586.

The previous prime is 998951561. The next prime is 998951609. The reversal of 998951587 is 785159899.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998951587 is a prime.

It is not a weakly prime, because it can be changed into another prime (998951557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499475793 + 499475794.

It is an arithmetic number, because the mean of its divisors is an integer number (499475794).

Almost surely, 2^998951587 is an apocalyptic number.

998951587 is a deficient number, since it is larger than the sum of its proper divisors (1).

998951587 is an equidigital number, since it uses as much as digits as its factorization.

998951587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 61.

The square root of 998951587 is about 31606.1953895118. The cubic root of 998951587 is about 999.6504067988.

The spelling of 998951587 in words is "nine hundred ninety-eight million, nine hundred fifty-one thousand, five hundred eighty-seven".