31700749 has 8 divisors (see below), whose sum is σ = 33353208. Its totient is φ = 30090240.

The previous prime is 31700743. The next prime is 31700803. The reversal of 31700749 is 94700713.

It can be written as a sum of positive squares in 4 ways, for example, as 4473225 + 27227524 = 2115^2 + 5218^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31700749 - 2¹¹ = 31698701 is a prime.

It is a super-2 number, since 2×31700749² = 2009874974322002, which contains 22 as substring.

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 31700749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31700743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8932 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (4169151).

Almost surely, 2^31700749 is an apocalyptic number.

It is an amenable number.

31700749 is a deficient number, since it is larger than the sum of its proper divisors (1652459).

31700749 is a wasteful number, since it uses less digits than its factorization.

31700749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20975.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 31700749 is about 5630.3418191083. The cubic root of 31700749 is about 316.4874606847.

The spelling of 31700749 in words is "thirty-one million, seven hundred thousand, seven hundred forty-nine".