1256122156 has 6 divisors (see below), whose sum is σ = 2198213780. Its totient is φ = 628061076.

The previous prime is 1256122117. The next prime is 1256122159. The reversal of 1256122156 is 6512216521.

It is not an unprimeable number, because it can be changed into a prime (1256122159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157015266 + ... + 157015273.

Almost surely, 2^1256122156 is an apocalyptic number.

It is an amenable number.

1256122156 is a deficient number, since it is larger than the sum of its proper divisors (942091624).

1256122156 is a wasteful number, since it uses less digits than its factorization.

1256122156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314030543 (or 314030541 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 1256122156 is about 35441.8136669104. The cubic root of 1256122156 is about 1078.9731197295.

Adding to 1256122156 its reverse (6512216521), we get a palindrome (7768338677).

The spelling of 1256122156 in words is "one billion, two hundred fifty-six million, one hundred twenty-two thousand, one hundred fifty-six".