3405721897 has 2 divisors, whose sum is σ = 3405721898. Its totient is φ = 3405721896.

The previous prime is 3405721873. The next prime is 3405721901. The reversal of 3405721897 is 7981275043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3398773401 + 6948496 = 58299^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 3405721897 - 2³¹ = 1258238249 is a prime.

It is not a weakly prime, because it can be changed into another prime (3405724897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1702860948 + 1702860949.

It is an arithmetic number, because the mean of its divisors is an integer number (1702860949).

Almost surely, 2^3405721897 is an apocalyptic number.

It is an amenable number.

3405721897 is a deficient number, since it is larger than the sum of its proper divisors (1).

3405721897 is an equidigital number, since it uses as much as digits as its factorization.

3405721897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 3405721897 is about 58358.5631848489. The cubic root of 3405721897 is about 1504.5376514526.

The spelling of 3405721897 in words is "three billion, four hundred five million, seven hundred twenty-one thousand, eight hundred ninety-seven".