31314749 has 4 divisors (see below), whose sum is σ = 31514364. Its totient is φ = 31115136.

The previous prime is 31314713. The next prime is 31314757. The reversal of 31314749 is 94741313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94741313 = 199 ⋅476087.

It can be written as a sum of positive squares in 2 ways, for example, as 7236100 + 24078649 = 2690^2 + 4907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31314749 is a prime.

It is a super-2 number, since 2×31314749² = 1961227009866002, which contains 22 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 (31314709) 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 3 ways as a sum of consecutive naturals, for example, 99572 + ... + 99885.

It is an arithmetic number, because the mean of its divisors is an integer number (7878591).

Almost surely, 2^31314749 is an apocalyptic number.

It is an amenable number.

31314749 is a deficient number, since it is larger than the sum of its proper divisors (199615).

31314749 is a wasteful number, since it uses less digits than its factorization.

31314749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199614.

The product of its digits is 9072, while the sum is 32.

The square root of 31314749 is about 5595.9582736114. The cubic root of 31314749 is about 315.1976554072.

The spelling of 31314749 in words is "thirty-one million, three hundred fourteen thousand, seven hundred forty-nine".