321270745 has 4 divisors (see below), whose sum is σ = 385524900. Its totient is φ = 257016592.

The previous prime is 321270721. The next prime is 321270749. The reversal of 321270745 is 547072123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547072123 = 13 ⋅42082471.

It can be written as a sum of positive squares in 2 ways, for example, as 253191744 + 68079001 = 15912^2 + 8251^2 .

It is a cyclic number.

It is not a de Polignac number, because 321270745 - 2¹¹ = 321268697 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (321270749) 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, 32127070 + ... + 32127079.

It is an arithmetic number, because the mean of its divisors is an integer number (96381225).

Almost surely, 2^321270745 is an apocalyptic number.

It is an amenable number.

321270745 is a deficient number, since it is larger than the sum of its proper divisors (64254155).

321270745 is an equidigital number, since it uses as much as digits as its factorization.

321270745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64254154.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 321270745 is about 17924.0270307763. The cubic root of 321270745 is about 684.8945759223.

The spelling of 321270745 in words is "three hundred twenty-one million, two hundred seventy thousand, seven hundred forty-five".