1321355745 has 24 divisors (see below), whose sum is σ = 2296359936. Its totient is φ = 702873888.

The previous prime is 1321355743. The next prime is 1321355759. The reversal of 1321355745 is 5475531231.

It is not a de Polignac number, because 1321355745 - 2¹ = 1321355743 is a prime.

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 in 23 ways as a sum of consecutive naturals, for example, 21099 + ... + 55568.

It is an arithmetic number, because the mean of its divisors is an integer number (95681664).

Almost surely, 2^1321355745 is an apocalyptic number.

1321355745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321355745 is a deficient number, since it is larger than the sum of its proper divisors (975004191).

1321355745 is a wasteful number, since it uses less digits than its factorization.

1321355745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77061 (or 77058 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The square root of 1321355745 is about 36350.4572873575. The cubic root of 1321355745 is about 1097.3367374928.

Adding to 1321355745 its reverse (5475531231), we get a palindrome (6796886976).

The spelling of 1321355745 in words is "one billion, three hundred twenty-one million, three hundred fifty-five thousand, seven hundred forty-five".