344972821 has 2 divisors, whose sum is σ = 344972822. Its totient is φ = 344972820.

The previous prime is 344972783. The next prime is 344972827. The reversal of 344972821 is 128279443.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334377796 + 10595025 = 18286^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 344972821 - 2²⁵ = 311418389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344972827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172486410 + 172486411.

It is an arithmetic number, because the mean of its divisors is an integer number (172486411).

Almost surely, 2^344972821 is an apocalyptic number.

It is an amenable number.

344972821 is a deficient number, since it is larger than the sum of its proper divisors (1).

344972821 is an equidigital number, since it uses as much as digits as its factorization.

344972821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 344972821 is about 18573.4439725109. The cubic root of 344972821 is about 701.3394902754.

The spelling of 344972821 in words is "three hundred forty-four million, nine hundred seventy-two thousand, eight hundred twenty-one".