31938149 has 2 divisors, whose sum is σ = 31938150. Its totient is φ = 31938148.

The previous prime is 31938097. The next prime is 31938167. The reversal of 31938149 is 94183913.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26853124 + 5085025 = 5182^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 31938149 - 2¹² = 31934053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31932149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15969074 + 15969075.

It is an arithmetic number, because the mean of its divisors is an integer number (15969075).

Almost surely, 2^31938149 is an apocalyptic number.

It is an amenable number.

31938149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31938149 is an equidigital number, since it uses as much as digits as its factorization.

31938149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 31938149 is about 5651.3846975763. The cubic root of 31938149 is about 317.2755319196.

The spelling of 31938149 in words is "thirty-one million, nine hundred thirty-eight thousand, one hundred forty-nine".