31313799 has 12 divisors (see below), whose sum is σ = 49343112. Its totient is φ = 18978000.

The previous prime is 31313771. The next prime is 31313809. The reversal of 31313799 is 99731313.

It is not a de Polignac number, because 31313799 - 2⁹ = 31313287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313749) 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 11 ways as a sum of consecutive naturals, for example, 158052 + ... + 158249.

It is an arithmetic number, because the mean of its divisors is an integer number (4111926).

Almost surely, 2^31313799 is an apocalyptic number.

31313799 is a deficient number, since it is larger than the sum of its proper divisors (18029313).

31313799 is a wasteful number, since it uses less digits than its factorization.

31313799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316318 (or 316315 counting only the distinct ones).

The product of its digits is 15309, while the sum is 36.

The square root of 31313799 is about 5595.8733902761. The cubic root of 31313799 is about 315.1944679763.

It can be divided in two parts, 313137 and 99, that added together give a triangular number (313236 = T₇₉₁).

The spelling of 31313799 in words is "thirty-one million, three hundred thirteen thousand, seven hundred ninety-nine".