249297779 has 2 divisors, whose sum is σ = 249297780. Its totient is φ = 249297778.

The previous prime is 249297773. The next prime is 249297791. The reversal of 249297779 is 977792942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249297779 - 2⁸ = 249297523 is a prime.

It is a super-2 number, since 2×249297779² = 124298765228665682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249297773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124648889 + 124648890.

It is an arithmetic number, because the mean of its divisors is an integer number (124648890).

Almost surely, 2^249297779 is an apocalyptic number.

249297779 is a deficient number, since it is larger than the sum of its proper divisors (1).

249297779 is an equidigital number, since it uses as much as digits as its factorization.

249297779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 56.

The square root of 249297779 is about 15789.1665074506. The cubic root of 249297779 is about 629.3701431509.

The spelling of 249297779 in words is "two hundred forty-nine million, two hundred ninety-seven thousand, seven hundred seventy-nine".