321661245 has 8 divisors (see below), whose sum is σ = 514658016. Its totient is φ = 171552656.

The previous prime is 321661237. The next prime is 321661273. The reversal of 321661245 is 542166123.

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

It is a cyclic number.

It is not a de Polignac number, because 321661245 - 2³ = 321661237 is a prime.

It is a congruent number.

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, 10722027 + ... + 10722056.

It is an arithmetic number, because the mean of its divisors is an integer number (64332252).

Almost surely, 2^321661245 is an apocalyptic number.

It is an amenable number.

321661245 is a deficient number, since it is larger than the sum of its proper divisors (192996771).

321661245 is a wasteful number, since it uses less digits than its factorization.

321661245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21444091.

The product of its digits is 8640, while the sum is 30.

The square root of 321661245 is about 17934.9169220267. The cubic root of 321661245 is about 685.1719567587.

It can be divided in two parts, 32166 and 1245, that added together give a triangular number (33411 = T₂₅₈).

The spelling of 321661245 in words is "three hundred twenty-one million, six hundred sixty-one thousand, two hundred forty-five".