31172149 has 2 divisors, whose sum is σ = 31172150. Its totient is φ = 31172148.

The previous prime is 31172137. The next prime is 31172171. The reversal of 31172149 is 94127113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 4028049 = 5210^2 + 2007^2 .

It is a cyclic number.

It is not a de Polignac number, because 31172149 - 2¹¹ = 31170101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31175149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15586074 + 15586075.

It is an arithmetic number, because the mean of its divisors is an integer number (15586075).

Almost surely, 2^31172149 is an apocalyptic number.

It is an amenable number.

31172149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31172149 is an equidigital number, since it uses as much as digits as its factorization.

31172149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 31172149 is about 5583.2023964746. The cubic root of 31172149 is about 314.7184819982.

The spelling of 31172149 in words is "thirty-one million, one hundred seventy-two thousand, one hundred forty-nine".