31731603149 has 2 divisors, whose sum is σ = 31731603150. Its totient is φ = 31731603148.

The previous prime is 31731603097. The next prime is 31731603157. The reversal of 31731603149 is 94130613713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30514849225 + 1216753924 = 174685^2 + 34882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31731603149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31731603649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15865801574 + 15865801575.

It is an arithmetic number, because the mean of its divisors is an integer number (15865801575).

Almost surely, 2^31731603149 is an apocalyptic number.

It is an amenable number.

31731603149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31731603149 is an equidigital number, since it uses as much as digits as its factorization.

31731603149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The spelling of 31731603149 in words is "thirty-one billion, seven hundred thirty-one million, six hundred three thousand, one hundred forty-nine".