1272731855 has 4 divisors (see below), whose sum is σ = 1527278232. Its totient is φ = 1018185480.

The previous prime is 1272731807. The next prime is 1272731857. The reversal of 1272731855 is 5581372721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5581372721 = 19 ⋅293756459.

It is not a de Polignac number, because 1272731855 - 2⁸ = 1272731599 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 (1272731857) 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, 127273181 + ... + 127273190.

It is an arithmetic number, because the mean of its divisors is an integer number (381819558).

Almost surely, 2^1272731855 is an apocalyptic number.

1272731855 is a deficient number, since it is larger than the sum of its proper divisors (254546377).

1272731855 is an equidigital number, since it uses as much as digits as its factorization.

1272731855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254546376.

The product of its digits is 117600, while the sum is 41.

The square root of 1272731855 is about 35675.3676224927. The cubic root of 1272731855 is about 1083.7080632374.

The spelling of 1272731855 in words is "one billion, two hundred seventy-two million, seven hundred thirty-one thousand, eight hundred fifty-five".