1255642679 has 4 divisors (see below), whose sum is σ = 1258713120. Its totient is φ = 1252572240.

The previous prime is 1255642673. The next prime is 1255642681. The reversal of 1255642679 is 9762465521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9762465521 = 70451 ⋅138571.

It is a cyclic number.

It is not a de Polignac number, because 1255642679 - 2¹² = 1255638583 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 (1255642673) 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, 1534607 + ... + 1535424.

It is an arithmetic number, because the mean of its divisors is an integer number (314678280).

Almost surely, 2^1255642679 is an apocalyptic number.

1255642679 is a deficient number, since it is larger than the sum of its proper divisors (3070441).

1255642679 is an equidigital number, since it uses as much as digits as its factorization.

1255642679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070440.

The product of its digits is 907200, while the sum is 47.

The square root of 1255642679 is about 35435.0487370908. The cubic root of 1255642679 is about 1078.8358165670.

The spelling of 1255642679 in words is "one billion, two hundred fifty-five million, six hundred forty-two thousand, six hundred seventy-nine".