251042137 has 2 divisors, whose sum is σ = 251042138. Its totient is φ = 251042136.

The previous prime is 251042081. The next prime is 251042147. The reversal of 251042137 is 731240152.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251032336 + 9801 = 15844^2 + 99^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251042137 is a prime.

It is not a weakly prime, because it can be changed into another prime (251042147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125521068 + 125521069.

It is an arithmetic number, because the mean of its divisors is an integer number (125521069).

Almost surely, 2^251042137 is an apocalyptic number.

It is an amenable number.

251042137 is a deficient number, since it is larger than the sum of its proper divisors (1).

251042137 is an equidigital number, since it uses as much as digits as its factorization.

251042137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 251042137 is about 15844.3092938758. The cubic root of 251042137 is about 630.8346516859.

Adding to 251042137 its reverse (731240152), we get a palindrome (982282289).

The spelling of 251042137 in words is "two hundred fifty-one million, forty-two thousand, one hundred thirty-seven".