998139151 has 4 divisors (see below), whose sum is σ = 998498304. Its totient is φ = 997780000.

The previous prime is 998139097. The next prime is 998139169. The reversal of 998139151 is 151931899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 998139151 - 2²¹ = 996041999 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 (998139851) 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, 175375 + ... + 180976.

It is an arithmetic number, because the mean of its divisors is an integer number (249624576).

Almost surely, 2^998139151 is an apocalyptic number.

998139151 is a deficient number, since it is larger than the sum of its proper divisors (359153).

998139151 is a wasteful number, since it uses less digits than its factorization.

998139151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359152.

The product of its digits is 87480, while the sum is 46.

The square root of 998139151 is about 31593.3402950685. The cubic root of 998139151 is about 999.3793318507.

The spelling of 998139151 in words is "nine hundred ninety-eight million, one hundred thirty-nine thousand, one hundred fifty-one".