1321773461 has 4 divisors (see below), whose sum is σ = 1334126592. Its totient is φ = 1309420332.

The previous prime is 1321773449. The next prime is 1321773493. The reversal of 1321773461 is 1643771231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1643771231 = 3697 ⋅444623.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321773461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321073461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6176405 + ... + 6176618.

It is an arithmetic number, because the mean of its divisors is an integer number (333531648).

Almost surely, 2^1321773461 is an apocalyptic number.

It is an amenable number.

1321773461 is a deficient number, since it is larger than the sum of its proper divisors (12353131).

1321773461 is a wasteful number, since it uses less digits than its factorization.

1321773461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12353130.

The product of its digits is 21168, while the sum is 35.

The square root of 1321773461 is about 36356.2025107134. The cubic root of 1321773461 is about 1097.4523578373.

The spelling of 1321773461 in words is "one billion, three hundred twenty-one million, seven hundred seventy-three thousand, four hundred sixty-one".