31286149 has 2 divisors, whose sum is σ = 31286150. Its totient is φ = 31286148.

The previous prime is 31286131. The next prime is 31286153. The reversal of 31286149 is 94168213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20930625 + 10355524 = 4575^2 + 3218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31286149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31286159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15643074 + 15643075.

It is an arithmetic number, because the mean of its divisors is an integer number (15643075).

Almost surely, 2^31286149 is an apocalyptic number.

It is an amenable number.

31286149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31286149 is an equidigital number, since it uses as much as digits as its factorization.

31286149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 31286149 is about 5593.4022741083. The cubic root of 31286149 is about 315.1016687022.

The spelling of 31286149 in words is "thirty-one million, two hundred eighty-six thousand, one hundred forty-nine".