1217075881 has 4 divisors (see below), whose sum is σ = 1390943872. Its totient is φ = 1043207892.

The previous prime is 1217075869. The next prime is 1217075921. The reversal of 1217075881 is 1885707121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1885707121 = 947 ⋅1991243.

It is a cyclic number.

It is not a de Polignac number, because 1217075881 - 2¹¹ = 1217073833 is a prime.

It is a super-2 number, since 2×1217075881² = 2962547400223852322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217075081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86933985 + ... + 86933998.

It is an arithmetic number, because the mean of its divisors is an integer number (347735968).

Almost surely, 2^1217075881 is an apocalyptic number.

It is an amenable number.

1217075881 is a deficient number, since it is larger than the sum of its proper divisors (173867991).

1217075881 is an equidigital number, since it uses as much as digits as its factorization.

1217075881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173867990.

The product of its (nonzero) digits is 31360, while the sum is 40.

The square root of 1217075881 is about 34886.6146394287. The cubic root of 1217075881 is about 1067.6753564580.

The spelling of 1217075881 in words is "one billion, two hundred seventeen million, seventy-five thousand, eight hundred eighty-one".