34971721 has 2 divisors, whose sum is σ = 34971722. Its totient is φ = 34971720.

The previous prime is 34971667. The next prime is 34971787. The reversal of 34971721 is 12717943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34386496 + 585225 = 5864^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 34971721 - 2¹⁹ = 34447433 is a prime.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (34971221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17485860 + 17485861.

It is an arithmetic number, because the mean of its divisors is an integer number (17485861).

Almost surely, 2^34971721 is an apocalyptic number.

It is an amenable number.

34971721 is a deficient number, since it is larger than the sum of its proper divisors (1).

34971721 is an equidigital number, since it uses as much as digits as its factorization.

34971721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 34971721 is about 5913.6892884222. The cubic root of 34971721 is about 327.0185096774.

The spelling of 34971721 in words is "thirty-four million, nine hundred seventy-one thousand, seven hundred twenty-one".