1255379691 has 8 divisors (see below), whose sum is σ = 1680063120. Its totient is φ = 833808032.

The previous prime is 1255379687. The next prime is 1255379701. The reversal of 1255379691 is 1969735521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1255379691 - 2² = 1255379687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255379691.

It is not an unprimeable number, because it can be changed into a prime (1255379611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777000 + ... + 778613.

It is an arithmetic number, because the mean of its divisors is an integer number (210007890).

Almost surely, 2^1255379691 is an apocalyptic number.

1255379691 is a deficient number, since it is larger than the sum of its proper divisors (424683429).

1255379691 is a wasteful number, since it uses less digits than its factorization.

1255379691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555885.

The product of its digits is 510300, while the sum is 48.

The square root of 1255379691 is about 35431.3376970162. The cubic root of 1255379691 is about 1078.7604924086.

The spelling of 1255379691 in words is "one billion, two hundred fifty-five million, three hundred seventy-nine thousand, six hundred ninety-one".