1272669791 has 4 divisors (see below), whose sum is σ = 1285270584. Its totient is φ = 1260069000.

The previous prime is 1272669763. The next prime is 1272669851. The reversal of 1272669791 is 1979662721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1272669791 - 2¹⁰ = 1272668767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272669731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6300245 + ... + 6300446.

It is an arithmetic number, because the mean of its divisors is an integer number (321317646).

Almost surely, 2^1272669791 is an apocalyptic number.

1272669791 is a deficient number, since it is larger than the sum of its proper divisors (12600793).

1272669791 is a wasteful number, since it uses less digits than its factorization.

1272669791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12600792.

The product of its digits is 571536, while the sum is 50.

The square root of 1272669791 is about 35674.4977680135. The cubic root of 1272669791 is about 1083.6904474947.

The spelling of 1272669791 in words is "one billion, two hundred seventy-two million, six hundred sixty-nine thousand, seven hundred ninety-one".