1272890191 has 2 divisors, whose sum is σ = 1272890192. Its totient is φ = 1272890190.

The previous prime is 1272890117. The next prime is 1272890197. The reversal of 1272890191 is 1910982721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272890191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272890197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636445095 + 636445096.

It is an arithmetic number, because the mean of its divisors is an integer number (636445096).

Almost surely, 2^1272890191 is an apocalyptic number.

1272890191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272890191 is an equidigital number, since it uses as much as digits as its factorization.

1272890191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 1272890191 is about 35677.5866756708. The cubic root of 1272890191 is about 1083.7530014502.

The spelling of 1272890191 in words is "one billion, two hundred seventy-two million, eight hundred ninety thousand, one hundred ninety-one".