249688819 has 2 divisors, whose sum is σ = 249688820. Its totient is φ = 249688818.

The previous prime is 249688801. The next prime is 249688837. The reversal of 249688819 is 918886942.

It is a balanced prime because it is at equal distance from previous prime (249688801) and next prime (249688837).

It is a cyclic number.

It is not a de Polignac number, because 249688819 - 2²¹ = 247591667 is a prime.

It is a super-2 number, since 2×249688819² = 124689012667229522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249688819.

It is not a weakly prime, because it can be changed into another prime (249688889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124844409 + 124844410.

It is an arithmetic number, because the mean of its divisors is an integer number (124844410).

Almost surely, 2^249688819 is an apocalyptic number.

249688819 is a deficient number, since it is larger than the sum of its proper divisors (1).

249688819 is an equidigital number, since it uses as much as digits as its factorization.

249688819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 55.

The square root of 249688819 is about 15801.5448295412. The cubic root of 249688819 is about 629.6990407640.

The spelling of 249688819 in words is "two hundred forty-nine million, six hundred eighty-eight thousand, eight hundred nineteen".