31399233 has 4 divisors (see below), whose sum is σ = 41865648. Its totient is φ = 20932820.

The previous prime is 31399223. The next prime is 31399237. The reversal of 31399233 is 33299313.

It is a happy number.

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: 33299313 = 3 ⋅11099771.

It is a cyclic number.

It is not a de Polignac number, because 31399233 - 2⁶ = 31399169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31399194 and 31399203.

It is not an unprimeable number, because it can be changed into a prime (31399237) 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, 5233203 + ... + 5233208.

It is an arithmetic number, because the mean of its divisors is an integer number (10466412).

Almost surely, 2^31399233 is an apocalyptic number.

It is an amenable number.

31399233 is a deficient number, since it is larger than the sum of its proper divisors (10466415).

31399233 is a wasteful number, since it uses less digits than its factorization.

31399233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10466414.

The product of its digits is 13122, while the sum is 33.

The square root of 31399233 is about 5603.5018515211. The cubic root of 31399233 is about 315.4808579216.

The spelling of 31399233 in words is "thirty-one million, three hundred ninety-nine thousand, two hundred thirty-three".