1249201849 has 4 divisors (see below), whose sum is σ = 1427659264. Its totient is φ = 1070744436.

The previous prime is 1249201847. The next prime is 1249201897. The reversal of 1249201849 is 9481029421.

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.

It is a cyclic number.

It is not a de Polignac number, because 1249201849 - 2¹ = 1249201847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249201843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89228697 + ... + 89228710.

It is an arithmetic number, because the mean of its divisors is an integer number (356914816).

Almost surely, 2^1249201849 is an apocalyptic number.

It is an amenable number.

1249201849 is a deficient number, since it is larger than the sum of its proper divisors (178457415).

1249201849 is an equidigital number, since it uses as much as digits as its factorization.

1249201849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178457414.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1249201849 is about 35344.0496972263. The cubic root of 1249201849 is about 1076.9880209727.

The spelling of 1249201849 in words is "one billion, two hundred forty-nine million, two hundred one thousand, eight hundred forty-nine".