31323949 has 4 divisors (see below), whose sum is σ = 31990464. Its totient is φ = 30657436.

The previous prime is 31323923. The next prime is 31323961. The reversal of 31323949 is 94932313.

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: 94932313 = 7 ⋅13561759.

It is a cyclic number.

It is not a de Polignac number, because 31323949 - 2⁵ = 31323917 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 (31323449) 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, 333187 + ... + 333280.

It is an arithmetic number, because the mean of its divisors is an integer number (7997616).

Almost surely, 2^31323949 is an apocalyptic number.

It is an amenable number.

31323949 is a deficient number, since it is larger than the sum of its proper divisors (666515).

31323949 is an equidigital number, since it uses as much as digits as its factorization.

31323949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666514.

The product of its digits is 17496, while the sum is 34.

The square root of 31323949 is about 5596.7802350995. The cubic root of 31323949 is about 315.2285198251.

The spelling of 31323949 in words is "thirty-one million, three hundred twenty-three thousand, nine hundred forty-nine".