1321753481 has 4 divisors (see below), whose sum is σ = 1326424272. Its totient is φ = 1317082692.

The previous prime is 1321753463. The next prime is 1321753483. The reversal of 1321753481 is 1843571231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1843571231 = 151 ⋅12209081.

It is a cyclic number.

It is not a de Polignac number, because 1321753481 - 2¹⁸ = 1321491337 is a prime.

It is a super-2 number, since 2×1321753481² = 3494064529071234722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321753483) 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, 2334971 + ... + 2335536.

It is an arithmetic number, because the mean of its divisors is an integer number (331606068).

Almost surely, 2^1321753481 is an apocalyptic number.

It is an amenable number.

1321753481 is a deficient number, since it is larger than the sum of its proper divisors (4670791).

1321753481 is an equidigital number, since it uses as much as digits as its factorization.

1321753481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670790.

The product of its digits is 20160, while the sum is 35.

The square root of 1321753481 is about 36355.9277285012. The cubic root of 1321753481 is about 1097.4468280928.

The spelling of 1321753481 in words is "one billion, three hundred twenty-one million, seven hundred fifty-three thousand, four hundred eighty-one".