34891921 has 2 divisors, whose sum is σ = 34891922. Its totient is φ = 34891920.

The previous prime is 34891841. The next prime is 34891931. The reversal of 34891921 is 12919843.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34680321 + 211600 = 5889^2 + 460^2 .

It is an emirp because it is prime and its reverse (12919843) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34891921 - 2⁷ = 34891793 is a prime.

It is not a weakly prime, because it can be changed into another prime (34891931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17445960 + 17445961.

It is an arithmetic number, because the mean of its divisors is an integer number (17445961).

Almost surely, 2^34891921 is an apocalyptic number.

It is an amenable number.

34891921 is a deficient number, since it is larger than the sum of its proper divisors (1).

34891921 is an equidigital number, since it uses as much as digits as its factorization.

34891921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 34891921 is about 5906.9383778739. The cubic root of 34891921 is about 326.7695852076.

The spelling of 34891921 in words is "thirty-four million, eight hundred ninety-one thousand, nine hundred twenty-one".