1272492913 has 2 divisors, whose sum is σ = 1272492914. Its totient is φ = 1272492912.

The previous prime is 1272492901. The next prime is 1272492931. The reversal of 1272492913 is 3192942721.

Together with next prime (1272492931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1269710689 + 2782224 = 35633^2 + 1668^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272492913 - 2¹⁷ = 1272361841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1272492983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636246456 + 636246457.

It is an arithmetic number, because the mean of its divisors is an integer number (636246457).

Almost surely, 2^1272492913 is an apocalyptic number.

It is an amenable number.

1272492913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272492913 is an equidigital number, since it uses as much as digits as its factorization.

1272492913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 1272492913 is about 35672.0186280508. The cubic root of 1272492913 is about 1083.6402407349.

The spelling of 1272492913 in words is "one billion, two hundred seventy-two million, four hundred ninety-two thousand, nine hundred thirteen".