34921561 has 2 divisors, whose sum is σ = 34921562. Its totient is φ = 34921560.

The previous prime is 34921559. The next prime is 34921573. The reversal of 34921561 is 16512943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28515600 + 6405961 = 5340^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 34921561 - 2¹ = 34921559 is a prime.

Together with 34921559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (34921591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17460780 + 17460781.

It is an arithmetic number, because the mean of its divisors is an integer number (17460781).

Almost surely, 2^34921561 is an apocalyptic number.

It is an amenable number.

34921561 is a deficient number, since it is larger than the sum of its proper divisors (1).

34921561 is an equidigital number, since it uses as much as digits as its factorization.

34921561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 34921561 is about 5909.4467592153. The cubic root of 34921561 is about 326.8620871296.

The spelling of 34921561 in words is "thirty-four million, nine hundred twenty-one thousand, five hundred sixty-one".