1227161601 has 6 divisors (see below), whose sum is σ = 1772566770. Its totient is φ = 818107728.

The previous prime is 1227161599. The next prime is 1227161623. The reversal of 1227161601 is 1061617221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 624950001 + 602211600 = 24999^2 + 24540^2 .

It is not a de Polignac number, because 1227161601 - 2¹ = 1227161599 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1227161671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68175636 + ... + 68175653.

It is an arithmetic number, because the mean of its divisors is an integer number (295427795).

It is a Proth number, since it is equal to 18725 ⋅ 2¹⁶ + 1 and 18725 < 2¹⁶.

Almost surely, 2^1227161601 is an apocalyptic number.

It is an amenable number.

1227161601 is a deficient number, since it is larger than the sum of its proper divisors (545405169).

1227161601 is a wasteful number, since it uses less digits than its factorization.

1227161601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136351295 (or 136351292 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1227161601 is about 35030.8664037874. The cubic root of 1227161601 is about 1070.6164674826.

Adding to 1227161601 its reverse (1061617221), we get a palindrome (2288778822).

The spelling of 1227161601 in words is "one billion, two hundred twenty-seven million, one hundred sixty-one thousand, six hundred one".