251133149 has 2 divisors, whose sum is σ = 251133150. Its totient is φ = 251133148.

The previous prime is 251133143. The next prime is 251133187. The reversal of 251133149 is 941331152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198105625 + 53027524 = 14075^2 + 7282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251133149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251133143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125566574 + 125566575.

It is an arithmetic number, because the mean of its divisors is an integer number (125566575).

Almost surely, 2^251133149 is an apocalyptic number.

It is an amenable number.

251133149 is a deficient number, since it is larger than the sum of its proper divisors (1).

251133149 is an equidigital number, since it uses as much as digits as its factorization.

251133149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 251133149 is about 15847.1811057992. The cubic root of 251133149 is about 630.9108760564.

The spelling of 251133149 in words is "two hundred fifty-one million, one hundred thirty-three thousand, one hundred forty-nine".