31310749 has 4 divisors (see below), whose sum is σ = 32390460. Its totient is φ = 30231040.

The previous prime is 31310743. The next prime is 31310759. The reversal of 31310749 is 94701313.

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 15960025 + 15350724 = 3995^2 + 3918^2 .

It is a cyclic number.

It is not a de Polignac number, because 31310749 - 2⁵ = 31310717 is a prime.

It is a super-4 number, since 4×31310749⁴ (a number of 31 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310743) 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, 539812 + ... + 539869.

It is an arithmetic number, because the mean of its divisors is an integer number (8097615).

Almost surely, 2^31310749 is an apocalyptic number.

It is an amenable number.

31310749 is a deficient number, since it is larger than the sum of its proper divisors (1079711).

31310749 is a wasteful number, since it uses less digits than its factorization.

31310749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079710.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 31310749 is about 5595.6008613910. The cubic root of 31310749 is about 315.1842342095.

The spelling of 31310749 in words is "thirty-one million, three hundred ten thousand, seven hundred forty-nine".