31323413 has 4 divisors (see below), whose sum is σ = 34171008. Its totient is φ = 28475820.

The previous prime is 31323403. The next prime is 31323431. The reversal of 31323413 is 31432313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31323413 - 2¹⁸ = 31061269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323403) 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, 1423781 + ... + 1423802.

It is an arithmetic number, because the mean of its divisors is an integer number (8542752).

Almost surely, 2^31323413 is an apocalyptic number.

It is an amenable number.

31323413 is a deficient number, since it is larger than the sum of its proper divisors (2847595).

31323413 is a wasteful number, since it uses less digits than its factorization.

31323413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847594.

The product of its digits is 648, while the sum is 20.

The square root of 31323413 is about 5596.7323502201. The cubic root of 31323413 is about 315.2267218030.

Adding to 31323413 its reverse (31432313), we get a palindrome (62755726).

Subtracting 31323413 from its reverse (31432313), we obtain a square (108900 = 330²).

The spelling of 31323413 in words is "thirty-one million, three hundred twenty-three thousand, four hundred thirteen".