1227664159 has 4 divisors (see below), whose sum is σ = 1227821920. Its totient is φ = 1227506400.

The previous prime is 1227664093. The next prime is 1227664183. The reversal of 1227664159 is 9514667221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9514667221 = 19 ⋅500771959.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227664159 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 (1227664199) 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, 66567 + ... + 82984.

It is an arithmetic number, because the mean of its divisors is an integer number (306955480).

Almost surely, 2^1227664159 is an apocalyptic number.

1227664159 is a deficient number, since it is larger than the sum of its proper divisors (157761).

1227664159 is an equidigital number, since it uses as much as digits as its factorization.

1227664159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157760.

The product of its digits is 181440, while the sum is 43.

The square root of 1227664159 is about 35038.0387436283. The cubic root of 1227664159 is about 1070.7625969569.

The spelling of 1227664159 in words is "one billion, two hundred twenty-seven million, six hundred sixty-four thousand, one hundred fifty-nine".