998642741 has 4 divisors (see below), whose sum is σ = 1002051372. Its totient is φ = 995234112.

The previous prime is 998642719. The next prime is 998642767. The reversal of 998642741 is 147246899.

998642741 = 22345² + 22346².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 147246899 = 809 ⋅182011.

It can be written as a sum of positive squares in 2 ways, for example, as 499299025 + 499343716 = 22345^2 + 22346^2 .

It is a cyclic number.

It is not a de Polignac number, because 998642741 - 2¹⁰ = 998641717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 998642741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998642941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703876 + ... + 1704461.

It is an arithmetic number, because the mean of its divisors is an integer number (250512843).

Almost surely, 2^998642741 is an apocalyptic number.

998642741 is the 22346-th centered square number.

It is an amenable number.

998642741 is a deficient number, since it is larger than the sum of its proper divisors (3408631).

998642741 is a wasteful number, since it uses less digits than its factorization.

998642741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408630.

The product of its digits is 870912, while the sum is 50.

The square root of 998642741 is about 31601.3091659191. The cubic root of 998642741 is about 999.5473754953.

The spelling of 998642741 in words is "nine hundred ninety-eight million, six hundred forty-two thousand, seven hundred forty-one".