1273157999 has 12 divisors (see below), whose sum is σ = 1368775464. Its totient is φ = 1183807104.

The previous prime is 1273157989. The next prime is 1273158017. The reversal of 1273157999 is 9997513721.

It is not a de Polignac number, because 1273157999 - 2⁴ = 1273157983 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 1273157999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273157969) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2552 + ... + 50525.

It is an arithmetic number, because the mean of its divisors is an integer number (114064622).

Almost surely, 2^1273157999 is an apocalyptic number.

1273157999 is a deficient number, since it is larger than the sum of its proper divisors (95617465).

1273157999 is an equidigital number, since it uses as much as digits as its factorization.

1273157999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53194 (or 53177 counting only the distinct ones).

The product of its digits is 1071630, while the sum is 53.

The square root of 1273157999 is about 35681.3396469359. The cubic root of 1273157999 is about 1083.8290010333.

The spelling of 1273157999 in words is "one billion, two hundred seventy-three million, one hundred fifty-seven thousand, nine hundred ninety-nine".