1249826849 has 4 divisors (see below), whose sum is σ = 1258104000. Its totient is φ = 1241549700.

The previous prime is 1249826827. The next prime is 1249826857. The reversal of 1249826849 is 9486289421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9486289421 = 7 ⋅1355184203.

It is a cyclic number.

It is not a de Polignac number, because 1249826849 - 2¹⁶ = 1249761313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1249826849.

It is not an unprimeable number, because it can be changed into a prime (1249826819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4138349 + ... + 4138650.

It is an arithmetic number, because the mean of its divisors is an integer number (314526000).

Almost surely, 2^1249826849 is an apocalyptic number.

It is an amenable number.

1249826849 is a deficient number, since it is larger than the sum of its proper divisors (8277151).

1249826849 is an equidigital number, since it uses as much as digits as its factorization.

1249826849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8277150.

The product of its digits is 1990656, while the sum is 53.

The square root of 1249826849 is about 35352.8902495963. The cubic root of 1249826849 is about 1077.1676037163.

The spelling of 1249826849 in words is "one billion, two hundred forty-nine million, eight hundred twenty-six thousand, eight hundred forty-nine".