249615869 has 2 divisors, whose sum is σ = 249615870. Its totient is φ = 249615868.

The previous prime is 249615857. The next prime is 249615887. The reversal of 249615869 is 968516942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232928644 + 16687225 = 15262^2 + 4085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249615869 is a prime.

It is a super-2 number, since 2×249615869² = 124616164113250322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249615829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124807934 + 124807935.

It is an arithmetic number, because the mean of its divisors is an integer number (124807935).

Almost surely, 2^249615869 is an apocalyptic number.

It is an amenable number.

249615869 is a deficient number, since it is larger than the sum of its proper divisors (1).

249615869 is an equidigital number, since it uses as much as digits as its factorization.

249615869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 249615869 is about 15799.2363423046. The cubic root of 249615869 is about 629.6377097313.

The spelling of 249615869 in words is "two hundred forty-nine million, six hundred fifteen thousand, eight hundred sixty-nine".