998749501 has 4 divisors (see below), whose sum is σ = 998879904. Its totient is φ = 998619100.

The previous prime is 998749489. The next prime is 998749513. The reversal of 998749501 is 105947899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105947899 = 2579 ⋅41081.

It is an interprime number because it is at equal distance from previous prime (998749489) and next prime (998749513).

It is a cyclic number.

It is not a de Polignac number, because 998749501 - 2²⁹ = 461878589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998749561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52945 + ... + 69286.

It is an arithmetic number, because the mean of its divisors is an integer number (249719976).

Almost surely, 2^998749501 is an apocalyptic number.

It is an amenable number.

998749501 is a deficient number, since it is larger than the sum of its proper divisors (130403).

998749501 is a wasteful number, since it uses less digits than its factorization.

998749501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130402.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 998749501 is about 31602.9982913014. The cubic root of 998749501 is about 999.5829931294.

The spelling of 998749501 in words is "nine hundred ninety-eight million, seven hundred forty-nine thousand, five hundred one".