1225226161 has 2 divisors, whose sum is σ = 1225226162. Its totient is φ = 1225226160.

The previous prime is 1225226063. The next prime is 1225226183. The reversal of 1225226161 is 1616225221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1094352561 + 130873600 = 33081^2 + 11440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225226161 - 2¹³ = 1225217969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1225326161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612613080 + 612613081.

It is an arithmetic number, because the mean of its divisors is an integer number (612613081).

Almost surely, 2^1225226161 is an apocalyptic number.

It is an amenable number.

1225226161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225226161 is an equidigital number, since it uses as much as digits as its factorization.

1225226161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 1225226161 is about 35003.2307223205. The cubic root of 1225226161 is about 1070.0533239795.

The spelling of 1225226161 in words is "one billion, two hundred twenty-five million, two hundred twenty-six thousand, one hundred sixty-one".