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, and also an emirpimes, since its reverse is a distinct semiprime: 31023313 = 3371 ⋅9203.
It is a cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 231332013 is an apocalyptic number.
It is an amenable number.
31332013 is an equidigital number, since it uses as much as digits as its factorization.
31332013 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 46034.
The square root of 31332013 is about 5597.5006029477. The cubic root of 31332013 is about 315.2555681886.
Adding to 31332013 its reverse (31023313), we get a palindrome (62355326).
The spelling of 31332013 in words is "thirty-one million, three hundred thirty-two thousand, thirteen".