251266349 has 2 divisors, whose sum is σ = 251266350. Its totient is φ = 251266348.

The previous prime is 251266333. The next prime is 251266387. The reversal of 251266349 is 943662152.

It is an a-pointer prime, because the next prime (251266387) can be obtained adding 251266349 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209728324 + 41538025 = 14482^2 + 6445^2 .

It is a cyclic number.

It is not a de Polignac number, because 251266349 - 2⁴ = 251266333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251266319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125633174 + 125633175.

It is an arithmetic number, because the mean of its divisors is an integer number (125633175).

Almost surely, 2^251266349 is an apocalyptic number.

It is an amenable number.

251266349 is a deficient number, since it is larger than the sum of its proper divisors (1).

251266349 is an equidigital number, since it uses as much as digits as its factorization.

251266349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 251266349 is about 15851.3831888577. The cubic root of 251266349 is about 631.0224005282.

The spelling of 251266349 in words is "two hundred fifty-one million, two hundred sixty-six thousand, three hundred forty-nine".