1291245279 has 16 divisors (see below), whose sum is σ = 1743946848. Its totient is φ = 849733632.

The previous prime is 1291245269. The next prime is 1291245287. The reversal of 1291245279 is 9725421921.

It is not a de Polignac number, because 1291245279 - 2⁵ = 1291245247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291245279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291245269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109939 + ... + 121115.

It is an arithmetic number, because the mean of its divisors is an integer number (108996678).

Almost surely, 2^1291245279 is an apocalyptic number.

1291245279 is a deficient number, since it is larger than the sum of its proper divisors (452701569).

1291245279 is a wasteful number, since it uses less digits than its factorization.

1291245279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11674.

The product of its digits is 90720, while the sum is 42.

The square root of 1291245279 is about 35933.9015276660. The cubic root of 1291245279 is about 1088.9374036998.

The spelling of 1291245279 in words is "one billion, two hundred ninety-one million, two hundred forty-five thousand, two hundred seventy-nine".