31322149 has 2 divisors, whose sum is σ = 31322150. Its totient is φ = 31322148.

The previous prime is 31322129. The next prime is 31322153. The reversal of 31322149 is 94122313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28965924 + 2356225 = 5382^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 31322149 - 2⁹ = 31321637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31322119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661074 + 15661075.

It is an arithmetic number, because the mean of its divisors is an integer number (15661075).

Almost surely, 2^31322149 is an apocalyptic number.

It is an amenable number.

31322149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31322149 is an equidigital number, since it uses as much as digits as its factorization.

31322149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 31322149 is about 5596.6194260464. The cubic root of 31322149 is about 315.2224816102. Note that the first 3 decimals are identical.

The spelling of 31322149 in words is "thirty-one million, three hundred twenty-two thousand, one hundred forty-nine".