31699309849 has 9 divisors (see below), whose sum is σ = 33141745119. Its totient is φ = 30317162040.

The previous prime is 31699309799. The next prime is 31699309907. The reversal of 31699309849 is 94890399613.

The square root of 31699309849 is 178043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6513619849 + 25185690000 = 80707^2 + 158700^2 .

It is not a de Polignac number, because 31699309849 - 2⁹ = 31699309337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31699309949) 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 8 ways as a sum of consecutive naturals, for example, 4091119 + ... + 4098859.

Almost surely, 2^31699309849 is an apocalyptic number.

31699309849 is the 178043-rd square number.

31699309849 is the 89022-nd centered octagonal number.

It is an amenable number.

31699309849 is a deficient number, since it is larger than the sum of its proper divisors (1442435270).

31699309849 is an frugal number, since it uses more digits than its factorization.

31699309849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15528 (or 7764 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 61.

The spelling of 31699309849 in words is "thirty-one billion, six hundred ninety-nine million, three hundred nine thousand, eight hundred forty-nine".