1273125681 has 40 divisors (see below), whose sum is σ = 1926773024. Its totient is φ = 837708480.

The previous prime is 1273125671. The next prime is 1273125683. The reversal of 1273125681 is 1865213721.

1273125681 is a `hidden beast` number, since 12 + 73 + 12 + 568 + 1 = 666.

1273125681 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1273125681 - 2⁹ = 1273125169 is a prime.

It is a super-2 number, since 2×1273125681² = 3241697999243427522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273125683) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2785605 + ... + 2786061.

Almost surely, 2^1273125681 is an apocalyptic number.

It is an amenable number.

1273125681 is a deficient number, since it is larger than the sum of its proper divisors (653647343).

1273125681 is a wasteful number, since it uses less digits than its factorization.

1273125681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 834 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1273125681 is about 35680.8867742942. The cubic root of 1273125681 is about 1083.8198302726.

The spelling of 1273125681 in words is "one billion, two hundred seventy-three million, one hundred twenty-five thousand, six hundred eighty-one".