31827149 has 2 divisors, whose sum is σ = 31827150. Its totient is φ = 31827148.

The previous prime is 31827143. The next prime is 31827151. The reversal of 31827149 is 94172813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31561924 + 265225 = 5618^2 + 515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31827149 is a prime.

It is a Sophie Germain prime.

Together with 31827151, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31827143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15913574 + 15913575.

It is an arithmetic number, because the mean of its divisors is an integer number (15913575).

Almost surely, 2^31827149 is an apocalyptic number.

It is an amenable number.

31827149 is a deficient number, since it is larger than the sum of its proper divisors (1).

31827149 is an equidigital number, since it uses as much as digits as its factorization.

31827149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 31827149 is about 5641.5555478963. Note that the first 4 decimals coincide. The cubic root of 31827149 is about 316.9075450106.

The spelling of 31827149 in words is "thirty-one million, eight hundred twenty-seven thousand, one hundred forty-nine".