1213664493 has 32 divisors (see below), whose sum is σ = 1779466752. Its totient is φ = 732672000.

The previous prime is 1213664453. The next prime is 1213664509. The reversal of 1213664493 is 3944663121.

It is not a de Polignac number, because 1213664493 - 2⁸ = 1213664237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213664443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148668 + ... + 156618.

It is an arithmetic number, because the mean of its divisors is an integer number (55608336).

Almost surely, 2^1213664493 is an apocalyptic number.

It is an amenable number.

1213664493 is a deficient number, since it is larger than the sum of its proper divisors (565802259).

1213664493 is a wasteful number, since it uses less digits than its factorization.

1213664493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8085.

The product of its digits is 93312, while the sum is 39.

The square root of 1213664493 is about 34837.6878251126. The cubic root of 1213664493 is about 1066.6768804469.

The spelling of 1213664493 in words is "one billion, two hundred thirteen million, six hundred sixty-four thousand, four hundred ninety-three".