1272216019 has 4 divisors (see below), whose sum is σ = 1303245720. Its totient is φ = 1241186320.

The previous prime is 1272215999. The next prime is 1272216053. The reversal of 1272216019 is 9106122721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9106122721 = 20089 ⋅453289.

It is a cyclic number.

It is not a de Polignac number, because 1272216019 - 2⁷ = 1272215891 is a prime.

It is a super-2 number, since 2×1272216019² = 3237067198000416722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272216119) 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, 15514789 + ... + 15514870.

It is an arithmetic number, because the mean of its divisors is an integer number (325811430).

Almost surely, 2^1272216019 is an apocalyptic number.

1272216019 is a deficient number, since it is larger than the sum of its proper divisors (31029701).

1272216019 is an equidigital number, since it uses as much as digits as its factorization.

1272216019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31029700.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1272216019 is about 35668.1373076868. The cubic root of 1272216019 is about 1083.5616351242.

The spelling of 1272216019 in words is "one billion, two hundred seventy-two million, two hundred sixteen thousand, nineteen".