251041013 has 2 divisors, whose sum is σ = 251041014. Its totient is φ = 251041012.

The previous prime is 251041001. The next prime is 251041031. The reversal of 251041013 is 310140152.

Together with next prime (251041031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168558289 + 82482724 = 12983^2 + 9082^2 .

It is a cyclic number.

It is not a de Polignac number, because 251041013 - 2⁶ = 251040949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 251040982 and 251041000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251041913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125520506 + 125520507.

It is an arithmetic number, because the mean of its divisors is an integer number (125520507).

Almost surely, 2^251041013 is an apocalyptic number.

It is an amenable number.

251041013 is a deficient number, since it is larger than the sum of its proper divisors (1).

251041013 is an equidigital number, since it uses as much as digits as its factorization.

251041013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 251041013 is about 15844.2738236878. The cubic root of 251041013 is about 630.8337101983.

Adding to 251041013 its reverse (310140152), we get a palindrome (561181165).

The spelling of 251041013 in words is "two hundred fifty-one million, forty-one thousand, thirteen".