998751761 has 6 divisors (see below), whose sum is σ = 1161813330. Its totient is φ = 856072896.

The previous prime is 998751727. The next prime is 998751799. The reversal of 998751761 is 167157899.

It can be written as a sum of positive squares in only one way, i.e., 632220736 + 366531025 = 25144^2 + 19145^2 .

It is not a de Polignac number, because 998751761 - 2²² = 994557457 is a prime.

It is a super-2 number, since 2×998751761² = 1995010160201202242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (998753761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10191296 + ... + 10191393.

It is an arithmetic number, because the mean of its divisors is an integer number (193635555).

Almost surely, 2^998751761 is an apocalyptic number.

It is an amenable number.

998751761 is a deficient number, since it is larger than the sum of its proper divisors (163061569).

998751761 is a wasteful number, since it uses less digits than its factorization.

998751761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20382703 (or 20382696 counting only the distinct ones).

The product of its digits is 952560, while the sum is 53.

The square root of 998751761 is about 31603.0340473822. The cubic root of 998751761 is about 999.5837470909.

The spelling of 998751761 in words is "nine hundred ninety-eight million, seven hundred fifty-one thousand, seven hundred sixty-one".