249436919 has 2 divisors, whose sum is σ = 249436920. Its totient is φ = 249436918.

The previous prime is 249436879. The next prime is 249436949. The reversal of 249436919 is 919634942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249436919 is a prime.

It is a super-2 number, since 2×249436919² = 124437553120425122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249436949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124718459 + 124718460.

It is an arithmetic number, because the mean of its divisors is an integer number (124718460).

Almost surely, 2^249436919 is an apocalyptic number.

249436919 is a deficient number, since it is larger than the sum of its proper divisors (1).

249436919 is an equidigital number, since it uses as much as digits as its factorization.

249436919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 249436919 is about 15793.5720785388. The cubic root of 249436919 is about 629.4872110141.

The spelling of 249436919 in words is "two hundred forty-nine million, four hundred thirty-six thousand, nine hundred nineteen".