998749579 has 2 divisors, whose sum is σ = 998749580. Its totient is φ = 998749578.

The previous prime is 998749571. The next prime is 998749639. The reversal of 998749579 is 975947899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998749579 - 2³ = 998749571 is a prime.

It is not a weakly prime, because it can be changed into another prime (998749571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499374789 + 499374790.

It is an arithmetic number, because the mean of its divisors is an integer number (499374790).

Almost surely, 2^998749579 is an apocalyptic number.

998749579 is a deficient number, since it is larger than the sum of its proper divisors (1).

998749579 is an equidigital number, since it uses as much as digits as its factorization.

998749579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51438240, while the sum is 67.

The square root of 998749579 is about 31602.9995253615. Note that the first 3 decimals coincide. The cubic root of 998749579 is about 999.5830191511.

The spelling of 998749579 in words is "nine hundred ninety-eight million, seven hundred forty-nine thousand, five hundred seventy-nine".