39131797 has 2 divisors, whose sum is σ = 39131798. Its totient is φ = 39131796.

The previous prime is 39131767. The next prime is 39131821. The reversal of 39131797 is 79713193.

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., 39050001 + 81796 = 6249^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 39131797 - 2⁷ = 39131669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39131737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19565898 + 19565899.

It is an arithmetic number, because the mean of its divisors is an integer number (19565899).

Almost surely, 2^39131797 is an apocalyptic number.

It is an amenable number.

39131797 is a deficient number, since it is larger than the sum of its proper divisors (1).

39131797 is an equidigital number, since it uses as much as digits as its factorization.

39131797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721, while the sum is 40.

The square root of 39131797 is about 6255.5413035164. The cubic root of 39131797 is about 339.5027246093.

The spelling of 39131797 in words is "thirty-nine million, one hundred thirty-one thousand, seven hundred ninety-seven".