349167821 has 2 divisors, whose sum is σ = 349167822. Its totient is φ = 349167820.

The previous prime is 349167757. The next prime is 349167823. The reversal of 349167821 is 128761943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349166596 + 1225 = 18686^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 349167821 - 2⁶ = 349167757 is a prime.

It is a Sophie Germain prime.

Together with 349167823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (349167823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174583910 + 174583911.

It is an arithmetic number, because the mean of its divisors is an integer number (174583911).

Almost surely, 2^349167821 is an apocalyptic number.

It is an amenable number.

349167821 is a deficient number, since it is larger than the sum of its proper divisors (1).

349167821 is an equidigital number, since it uses as much as digits as its factorization.

349167821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 349167821 is about 18686.0327785220. The cubic root of 349167821 is about 704.1708952856.

The spelling of 349167821 in words is "three hundred forty-nine million, one hundred sixty-seven thousand, eight hundred twenty-one".