830561621 has 8 divisors (see below), whose sum is σ = 846266688. Its totient is φ = 814968000.

The previous prime is 830561609. The next prime is 830561623. The reversal of 830561621 is 126165038.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-830561621 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 (830561623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12740 + ... + 42701.

It is an arithmetic number, because the mean of its divisors is an integer number (105783336).

Almost surely, 2^830561621 is an apocalyptic number.

It is an amenable number.

830561621 is a deficient number, since it is larger than the sum of its proper divisors (15705067).

830561621 is a wasteful number, since it uses less digits than its factorization.

830561621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55723.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 830561621 is about 28819.4660082383. The cubic root of 830561621 is about 939.9915575672.

The spelling of 830561621 in words is "eight hundred thirty million, five hundred sixty-one thousand, six hundred twenty-one".