34216561 has 2 divisors, whose sum is σ = 34216562. Its totient is φ = 34216560.

The previous prime is 34216541. The next prime is 34216573. The reversal of 34216561 is 16561243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25401600 + 8814961 = 5040^2 + 2969^2 .

It is an emirp because it is prime and its reverse (16561243) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34216561 - 2¹⁷ = 34085489 is a prime.

It is not a weakly prime, because it can be changed into another prime (34216541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17108280 + 17108281.

It is an arithmetic number, because the mean of its divisors is an integer number (17108281).

Almost surely, 2^34216561 is an apocalyptic number.

It is an amenable number.

34216561 is a deficient number, since it is larger than the sum of its proper divisors (1).

34216561 is an equidigital number, since it uses as much as digits as its factorization.

34216561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 34216561 is about 5849.4923711379. The cubic root of 34216561 is about 324.6475421631.

The spelling of 34216561 in words is "thirty-four million, two hundred sixteen thousand, five hundred sixty-one".