354936821 has 4 divisors (see below), whose sum is σ = 354976812. Its totient is φ = 354896832.

The previous prime is 354936817. The next prime is 354936823. The reversal of 354936821 is 128639453.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 970225 + 353966596 = 985^2 + 18814^2 .

It is a cyclic number.

It is not a de Polignac number, because 354936821 - 2² = 354936817 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 (354936823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 26643.

It is an arithmetic number, because the mean of its divisors is an integer number (88744203).

Almost surely, 2^354936821 is an apocalyptic number.

It is an amenable number.

354936821 is a deficient number, since it is larger than the sum of its proper divisors (39991).

354936821 is a wasteful number, since it uses less digits than its factorization.

354936821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39990.

The product of its digits is 155520, while the sum is 41.

The square root of 354936821 is about 18839.7670102366. The cubic root of 354936821 is about 708.0278677839.

The spelling of 354936821 in words is "three hundred fifty-four million, nine hundred thirty-six thousand, eight hundred twenty-one".