1321543051 has 4 divisors (see below), whose sum is σ = 1364173504. Its totient is φ = 1278912600.

The previous prime is 1321543033. The next prime is 1321543057. The reversal of 1321543051 is 1503451231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321543051 - 2⁵ = 1321543019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321543057) 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, 21315180 + ... + 21315241.

It is an arithmetic number, because the mean of its divisors is an integer number (341043376).

Almost surely, 2^1321543051 is an apocalyptic number.

1321543051 is a deficient number, since it is larger than the sum of its proper divisors (42630453).

1321543051 is an equidigital number, since it uses as much as digits as its factorization.

1321543051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42630452.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1321543051 is about 36353.0335873088. The cubic root of 1321543051 is about 1097.3885852622.

Adding to 1321543051 its reverse (1503451231), we get a palindrome (2824994282).

The spelling of 1321543051 in words is "one billion, three hundred twenty-one million, five hundred forty-three thousand, fifty-one".