1255818947 has 4 divisors (see below), whose sum is σ = 1261030056. Its totient is φ = 1250607840.

The previous prime is 1255818943. The next prime is 1255818983. The reversal of 1255818947 is 7498185521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7498185521 = 8647 ⋅867143.

It is a cyclic number.

It is not a de Polignac number, because 1255818947 - 2² = 1255818943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1255818895 and 1255818904.

It is not an unprimeable number, because it can be changed into a prime (1255818943) 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, 2605193 + ... + 2605674.

It is an arithmetic number, because the mean of its divisors is an integer number (315257514).

Almost surely, 2^1255818947 is an apocalyptic number.

1255818947 is a deficient number, since it is larger than the sum of its proper divisors (5211109).

1255818947 is an equidigital number, since it uses as much as digits as its factorization.

1255818947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5211108.

The product of its digits is 806400, while the sum is 50.

The square root of 1255818947 is about 35437.5358483064. The cubic root of 1255818947 is about 1078.8862967811.

The spelling of 1255818947 in words is "one billion, two hundred fifty-five million, eight hundred eighteen thousand, nine hundred forty-seven".