1227678161 has 2 divisors, whose sum is σ = 1227678162. Its totient is φ = 1227678160.

The previous prime is 1227678059. The next prime is 1227678173. The reversal of 1227678161 is 1618767221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1038450625 + 189227536 = 32225^2 + 13756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227678161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1227678181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613839080 + 613839081.

It is an arithmetic number, because the mean of its divisors is an integer number (613839081).

Almost surely, 2^1227678161 is an apocalyptic number.

It is an amenable number.

1227678161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227678161 is an equidigital number, since it uses as much as digits as its factorization.

1227678161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 1227678161 is about 35038.2385544707. The cubic root of 1227678161 is about 1070.7666677664.

The spelling of 1227678161 in words is "one billion, two hundred twenty-seven million, six hundred seventy-eight thousand, one hundred sixty-one".