1321355746 has 4 divisors (see below), whose sum is σ = 1982033622. Its totient is φ = 660677872.

The previous prime is 1321355743. The next prime is 1321355759. The reversal of 1321355746 is 6475531231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6475531231 = 13 ⋅498117787.

It can be written as a sum of positive squares in only one way, i.e., 853282521 + 468073225 = 29211^2 + 21635^2 .

It is not an unprimeable number, because it can be changed into a prime (1321355743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330338935 + ... + 330338938.

Almost surely, 2^1321355746 is an apocalyptic number.

1321355746 is a deficient number, since it is larger than the sum of its proper divisors (660677876).

1321355746 is an equidigital number, since it uses as much as digits as its factorization.

1321355746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660677875.

The product of its digits is 75600, while the sum is 37.

The square root of 1321355746 is about 36350.4573011125. The cubic root of 1321355746 is about 1097.3367377696.

Adding to 1321355746 its reverse (6475531231), we get a palindrome (7796886977).

The spelling of 1321355746 in words is "one billion, three hundred twenty-one million, three hundred fifty-five thousand, seven hundred forty-six".