9999999749 has 4 divisors (see below), whose sum is σ = 10088495436. Its totient is φ = 9911504064.

The previous prime is 9999999727. The next prime is 9999999769. The reversal of 9999999749 is 9479999999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5332650625 + 4667349124 = 73025^2 + 68318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999999749 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 (9999999769) 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, 44247674 + ... + 44247899.

It is an arithmetic number, because the mean of its divisors is an integer number (2522123859).

Almost surely, 2^9999999749 is an apocalyptic number.

It is an amenable number.

9999999749 is a deficient number, since it is larger than the sum of its proper divisors (88495687).

9999999749 is a wasteful number, since it uses less digits than its factorization.

9999999749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88495686.

The product of its digits is 1205308188, while the sum is 83.

The square root of 9999999749 is about 99999.9987450000. The cubic root of 9999999749 is about 2154.4346720064.

The spelling of 9999999749 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred forty-nine".