1161256219 has 4 divisors (see below), whose sum is σ = 1161467296. Its totient is φ = 1161045144.

The previous prime is 1161256183. The next prime is 1161256241. The reversal of 1161256219 is 9126521611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9126521611 = 5717 ⋅1596383.

It is a cyclic number.

It is not a de Polignac number, because 1161256219 - 2⁷ = 1161256091 is a prime.

It is a super-2 number, since 2×1161256219² = 2697032012332351922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161256619) 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 in 3 ways as a sum of consecutive naturals, for example, 97059 + ... + 108364.

It is an arithmetic number, because the mean of its divisors is an integer number (290366824).

Almost surely, 2^1161256219 is an apocalyptic number.

1161256219 is a deficient number, since it is larger than the sum of its proper divisors (211077).

1161256219 is an equidigital number, since it uses as much as digits as its factorization.

1161256219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211076.

The product of its digits is 6480, while the sum is 34.

The square root of 1161256219 is about 34077.2096715679. The cubic root of 1161256219 is about 1051.0967282903.

The spelling of 1161256219 in words is "one billion, one hundred sixty-one million, two hundred fifty-six thousand, two hundred nineteen".