1249689005 has 16 divisors (see below), whose sum is σ = 1559673984. Its totient is φ = 960482880.

The previous prime is 1249688987. The next prime is 1249689011. The reversal of 1249689005 is 5009869421.

It is not a de Polignac number, because 1249689005 - 2²⁴ = 1232911789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34529 + ... + 60758.

It is an arithmetic number, because the mean of its divisors is an integer number (97479624).

Almost surely, 2^1249689005 is an apocalyptic number.

It is an amenable number.

1249689005 is a deficient number, since it is larger than the sum of its proper divisors (309984979).

1249689005 is an equidigital number, since it uses as much as digits as its factorization.

1249689005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95396.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 1249689005 is about 35350.9406522655. The cubic root of 1249689005 is about 1077.1280018173.

The spelling of 1249689005 in words is "one billion, two hundred forty-nine million, six hundred eighty-nine thousand, five".