31313099 has 4 divisors (see below), whose sum is σ = 33155064. Its totient is φ = 29471136.

The previous prime is 31313081. The next prime is 31313119. The reversal of 31313099 is 99031313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31313099 - 2¹⁶ = 31247563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313039) 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, 920957 + ... + 920990.

It is an arithmetic number, because the mean of its divisors is an integer number (8288766).

Almost surely, 2^31313099 is an apocalyptic number.

31313099 is a deficient number, since it is larger than the sum of its proper divisors (1841965).

31313099 is a wasteful number, since it uses less digits than its factorization.

31313099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841964.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 31313099 is about 5595.8108438367. The cubic root of 31313099 is about 315.1921193017.

The spelling of 31313099 in words is "thirty-one million, three hundred thirteen thousand, ninety-nine".