1257119999 has 4 divisors (see below), whose sum is σ = 1268653320. Its totient is φ = 1245586680.

The previous prime is 1257119989. The next prime is 1257120001. The reversal of 1257119999 is 9999117521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1257119999 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 1257119999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257119989) 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, 5766497 + ... + 5766714.

It is an arithmetic number, because the mean of its divisors is an integer number (317163330).

Almost surely, 2^1257119999 is an apocalyptic number.

1257119999 is a deficient number, since it is larger than the sum of its proper divisors (11533321).

1257119999 is a wasteful number, since it uses less digits than its factorization.

1257119999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11533320.

The product of its digits is 459270, while the sum is 53.

The square root of 1257119999 is about 35455.8880723639. Note that the first 3 decimals coincide. The cubic root of 1257119999 is about 1079.2587503389.

The spelling of 1257119999 in words is "one billion, two hundred fifty-seven million, one hundred nineteen thousand, nine hundred ninety-nine".