1321023547 has 2 divisors, whose sum is σ = 1321023548. Its totient is φ = 1321023546.

The previous prime is 1321023527. The next prime is 1321023563. The reversal of 1321023547 is 7453201231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321023547 - 2⁷ = 1321023419 is a prime.

It is a super-2 number, since 2×1321023547² = 3490206423456922418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321023527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660511773 + 660511774.

It is an arithmetic number, because the mean of its divisors is an integer number (660511774).

Almost surely, 2^1321023547 is an apocalyptic number.

1321023547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321023547 is an equidigital number, since it uses as much as digits as its factorization.

1321023547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 1321023547 is about 36345.8876215728. The cubic root of 1321023547 is about 1097.2447704294.

Adding to 1321023547 its reverse (7453201231), we get a palindrome (8774224778).

The spelling of 1321023547 in words is "one billion, three hundred twenty-one million, twenty-three thousand, five hundred forty-seven".