249920651 has 2 divisors, whose sum is σ = 249920652. Its totient is φ = 249920650.

The previous prime is 249920609. The next prime is 249920659. The reversal of 249920651 is 156029942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249920651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249920659) 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, 124960325 + 124960326.

It is an arithmetic number, because the mean of its divisors is an integer number (124960326).

Almost surely, 2^249920651 is an apocalyptic number.

249920651 is a deficient number, since it is larger than the sum of its proper divisors (1).

249920651 is an equidigital number, since it uses as much as digits as its factorization.

249920651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 249920651 is about 15808.8788660044. The cubic root of 249920651 is about 629.8938689112.

The spelling of 249920651 in words is "two hundred forty-nine million, nine hundred twenty thousand, six hundred fifty-one".