1321122545 has 8 divisors (see below), whose sum is σ = 1585944360. Its totient is φ = 1056499840.

The previous prime is 1321122533. The next prime is 1321122557. The reversal of 1321122545 is 5452211231.

It is an interprime number because it is at equal distance from previous prime (1321122533) and next prime (1321122557).

It can be written as a sum of positive squares in 4 ways, for example, as 910168561 + 410953984 = 30169^2 + 20272^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321122545 - 2⁴ = 1321122529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34766 + ... + 62055.

It is an arithmetic number, because the mean of its divisors is an integer number (198243045).

Almost surely, 2^1321122545 is an apocalyptic number.

It is an amenable number.

1321122545 is a deficient number, since it is larger than the sum of its proper divisors (264821815).

1321122545 is an equidigital number, since it uses as much as digits as its factorization.

1321122545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99555.

The product of its digits is 2400, while the sum is 26.

The square root of 1321122545 is about 36347.2494832828. The cubic root of 1321122545 is about 1097.2721790563.

Adding to 1321122545 its reverse (5452211231), we get a palindrome (6773333776).

The spelling of 1321122545 in words is "one billion, three hundred twenty-one million, one hundred twenty-two thousand, five hundred forty-five".