31943149 has 6 divisors (see below), whose sum is σ = 37158414. Its totient is φ = 27379800.

The previous prime is 31943117. The next prime is 31943183. The reversal of 31943149 is 94134913.

It can be written as a sum of positive squares in only one way, i.e., 27562500 + 4380649 = 5250^2 + 2093^2 .

It is not a de Polignac number, because 31943149 - 2⁵ = 31943117 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 (31943449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 325902 + ... + 325999.

It is an arithmetic number, because the mean of its divisors is an integer number (6193069).

Almost surely, 2^31943149 is an apocalyptic number.

It is an amenable number.

31943149 is a deficient number, since it is larger than the sum of its proper divisors (5215265).

31943149 is an equidigital number, since it uses as much as digits as its factorization.

31943149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651915 (or 651908 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 31943149 is about 5651.8270497247. The cubic root of 31943149 is about 317.2920878246.

The spelling of 31943149 in words is "thirty-one million, nine hundred forty-three thousand, one hundred forty-nine".