1321725359 has 4 divisors (see below), whose sum is σ = 1357447704. Its totient is φ = 1286003016.

The previous prime is 1321725319. The next prime is 1321725397. The reversal of 1321725359 is 9535271231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321725359 - 2⁸ = 1321725103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321725319) 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, 17861117 + ... + 17861190.

It is an arithmetic number, because the mean of its divisors is an integer number (339361926).

Almost surely, 2^1321725359 is an apocalyptic number.

1321725359 is a deficient number, since it is larger than the sum of its proper divisors (35722345).

1321725359 is an equidigital number, since it uses as much as digits as its factorization.

1321725359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35722344.

The product of its digits is 56700, while the sum is 38.

The square root of 1321725359 is about 36355.5409669558. The cubic root of 1321725359 is about 1097.4390448415.

The spelling of 1321725359 in words is "one billion, three hundred twenty-one million, seven hundred twenty-five thousand, three hundred fifty-nine".