1255972687 has 16 divisors (see below), whose sum is σ = 1322972640. Its totient is φ = 1190673792.

The previous prime is 1255972651. The next prime is 1255972693. The reversal of 1255972687 is 7862795521.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255972687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255972787) 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 15 ways as a sum of consecutive naturals, for example, 723873 + ... + 725605.

It is an arithmetic number, because the mean of its divisors is an integer number (82685790).

Almost surely, 2^1255972687 is an apocalyptic number.

1255972687 is a deficient number, since it is larger than the sum of its proper divisors (66999953).

1255972687 is a wasteful number, since it uses less digits than its factorization.

1255972687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202.

The product of its digits is 2116800, while the sum is 52.

The square root of 1255972687 is about 35439.7049508034. The cubic root of 1255972687 is about 1078.9303214954.

The spelling of 1255972687 in words is "one billion, two hundred fifty-five million, nine hundred seventy-two thousand, six hundred eighty-seven".