31321323 has 20 divisors (see below), whose sum is σ = 51043608. Its totient is φ = 18982080.

The previous prime is 31321321. The next prime is 31321349. The reversal of 31321323 is 32312313.

It is not a de Polignac number, because 31321323 - 2¹ = 31321321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31321296 and 31321305.

It is not an unprimeable number, because it can be changed into a prime (31321321) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16686 + ... + 18467.

Almost surely, 2^31321323 is an apocalyptic number.

31321323 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31321323 is a deficient number, since it is larger than the sum of its proper divisors (19722285).

31321323 is a wasteful number, since it uses less digits than its factorization.

31321323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35176 (or 35167 counting only the distinct ones).

The product of its digits is 324, while the sum is 18.

The square root of 31321323 is about 5596.5456310120. The cubic root of 31321323 is about 315.2197106630.

Adding to 31321323 its reverse (32312313), we get a palindrome (63633636).

It can be divided in two parts, 313213 and 23, that added together give a triangular number (313236 = T₇₉₁).

The spelling of 31321323 in words is "thirty-one million, three hundred twenty-one thousand, three hundred twenty-three".