1261972807 has 2 divisors, whose sum is σ = 1261972808. Its totient is φ = 1261972806.

The previous prime is 1261972783. The next prime is 1261972909. The reversal of 1261972807 is 7082791621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261972807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261972507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630986403 + 630986404.

It is an arithmetic number, because the mean of its divisors is an integer number (630986404).

Almost surely, 2^1261972807 is an apocalyptic number.

1261972807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261972807 is an equidigital number, since it uses as much as digits as its factorization.

1261972807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 1261972807 is about 35524.2566002443. The cubic root of 1261972807 is about 1080.6457064059.

The spelling of 1261972807 in words is "one billion, two hundred sixty-one million, nine hundred seventy-two thousand, eight hundred seven".