1249951745 has 16 divisors (see below), whose sum is σ = 1714867968. Its totient is φ = 856785600.

The previous prime is 1249951739. The next prime is 1249951753. The reversal of 1249951745 is 5471599421.

It is a de Polignac number, because none of the positive numbers 2^k-1249951745 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1249951745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121295 + ... + 131195.

It is an arithmetic number, because the mean of its divisors is an integer number (107179248).

Almost surely, 2^1249951745 is an apocalyptic number.

It is an amenable number.

1249951745 is a deficient number, since it is larger than the sum of its proper divisors (464916223).

1249951745 is an equidigital number, since it uses as much as digits as its factorization.

1249951745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13520.

The product of its digits is 453600, while the sum is 47.

The square root of 1249951745 is about 35354.6566239866. The cubic root of 1249951745 is about 1077.2034832048.

The spelling of 1249951745 in words is "one billion, two hundred forty-nine million, nine hundred fifty-one thousand, seven hundred forty-five".