834177921 has 4 divisors (see below), whose sum is σ = 1112237232. Its totient is φ = 556118612.

The previous prime is 834177893. The next prime is 834177959. The reversal of 834177921 is 129771438.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 834177921 - 2⁵ = 834177889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (834177991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139029651 + ... + 139029656.

It is an arithmetic number, because the mean of its divisors is an integer number (278059308).

Almost surely, 2^834177921 is an apocalyptic number.

It is an amenable number.

834177921 is a deficient number, since it is larger than the sum of its proper divisors (278059311).

834177921 is a wasteful number, since it uses less digits than its factorization.

834177921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278059310.

The product of its digits is 84672, while the sum is 42.

The square root of 834177921 is about 28882.1384422968. The cubic root of 834177921 is about 941.3538365082.

The spelling of 834177921 in words is "eight hundred thirty-four million, one hundred seventy-seven thousand, nine hundred twenty-one".