998861057 has 4 divisors (see below), whose sum is σ = 998973360. Its totient is φ = 998748756.

The previous prime is 998861053. The next prime is 998861081. The reversal of 998861057 is 750168899.

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: 750168899 = 7951 ⋅94349.

It is a cyclic number.

It is not a de Polignac number, because 998861057 - 2² = 998861053 is a prime.

It is a super-2 number, since 2×998861057² = 1995446822382314498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998861051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41543 + ... + 61020.

It is an arithmetic number, because the mean of its divisors is an integer number (249743340).

Almost surely, 2^998861057 is an apocalyptic number.

It is an amenable number.

998861057 is a deficient number, since it is larger than the sum of its proper divisors (112303).

998861057 is a wasteful number, since it uses less digits than its factorization.

998861057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112302.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 998861057 is about 31604.7632011379. The cubic root of 998861057 is about 999.6202081097.

The spelling of 998861057 in words is "nine hundred ninety-eight million, eight hundred sixty-one thousand, fifty-seven".