1273664361 has 16 divisors (see below), whose sum is σ = 1822751424. Its totient is φ = 788212224.

The previous prime is 1273664347. The next prime is 1273664363. The reversal of 1273664361 is 1634663721.

It is not a de Polignac number, because 1273664361 - 2¹⁰ = 1273663337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1273664363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167331 + ... + 174776.

It is an arithmetic number, because the mean of its divisors is an integer number (113921964).

Almost surely, 2^1273664361 is an apocalyptic number.

It is an amenable number.

1273664361 is a deficient number, since it is larger than the sum of its proper divisors (549087063).

1273664361 is a wasteful number, since it uses less digits than its factorization.

1273664361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342200.

The product of its digits is 108864, while the sum is 39.

The square root of 1273664361 is about 35688.4345551889. The cubic root of 1273664361 is about 1083.9726692659.

The spelling of 1273664361 in words is "one billion, two hundred seventy-three million, six hundred sixty-four thousand, three hundred sixty-one".