1320377543 has 4 divisors (see below), whose sum is σ = 1322418960. Its totient is φ = 1318336128.

The previous prime is 1320377477. The next prime is 1320377549. The reversal of 1320377543 is 3457730231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3457730231 = 23 ⋅150336097.

It is a cyclic number.

It is not a de Polignac number, because 1320377543 - 2¹² = 1320373447 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 (1320377549) 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, 1019738 + ... + 1021031.

It is an arithmetic number, because the mean of its divisors is an integer number (330604740).

Almost surely, 2^1320377543 is an apocalyptic number.

1320377543 is a deficient number, since it is larger than the sum of its proper divisors (2041417).

1320377543 is an equidigital number, since it uses as much as digits as its factorization.

1320377543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041416.

The product of its (nonzero) digits is 52920, while the sum is 35.

The square root of 1320377543 is about 36336.9996422379. Note that the first 3 decimals coincide. The cubic root of 1320377543 is about 1097.0658838667.

The spelling of 1320377543 in words is "one billion, three hundred twenty million, three hundred seventy-seven thousand, five hundred forty-three".