1321743511 has 4 divisors (see below), whose sum is σ = 1441902024. Its totient is φ = 1201585000.

The previous prime is 1321743509. The next prime is 1321743517. The reversal of 1321743511 is 1153471231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1153471231 = 11 ⋅104861021.

It is not a de Polignac number, because 1321743511 - 2¹ = 1321743509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321743511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321743517) 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, 60079240 + ... + 60079261.

It is an arithmetic number, because the mean of its divisors is an integer number (360475506).

Almost surely, 2^1321743511 is an apocalyptic number.

1321743511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321743511 is a deficient number, since it is larger than the sum of its proper divisors (120158513).

1321743511 is a wasteful number, since it uses less digits than its factorization.

1321743511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120158512.

The product of its digits is 2520, while the sum is 28.

The square root of 1321743511 is about 36355.7906116756. The cubic root of 1321743511 is about 1097.4440687350. Note that the first 3 decimals are identical.

The spelling of 1321743511 in words is "one billion, three hundred twenty-one million, seven hundred forty-three thousand, five hundred eleven".