830969521 has 4 divisors (see below), whose sum is σ = 839197044. Its totient is φ = 822742000.

The previous prime is 830969497. The next prime is 830969543. The reversal of 830969521 is 125969038.

It is a happy number.

830969521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 740928400 + 90041121 = 27220^2 + 9489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-830969521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (830969551) 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, 4113610 + ... + 4113811.

It is an arithmetic number, because the mean of its divisors is an integer number (209799261).

Almost surely, 2^830969521 is an apocalyptic number.

It is an amenable number.

830969521 is a deficient number, since it is larger than the sum of its proper divisors (8227523).

830969521 is a wasteful number, since it uses less digits than its factorization.

830969521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8227522.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 830969521 is about 28826.5419535538. The cubic root of 830969521 is about 940.1454132217.

The spelling of 830969521 in words is "eight hundred thirty million, nine hundred sixty-nine thousand, five hundred twenty-one".