34021861 has 2 divisors, whose sum is σ = 34021862. Its totient is φ = 34021860.

The previous prime is 34021859. The next prime is 34021873. The reversal of 34021861 is 16812043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32421636 + 1600225 = 5694^2 + 1265^2 .

It is an emirp because it is prime and its reverse (16812043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34021861 - 2¹ = 34021859 is a prime.

Together with 34021859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34021831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17010930 + 17010931.

It is an arithmetic number, because the mean of its divisors is an integer number (17010931).

Almost surely, 2^34021861 is an apocalyptic number.

It is an amenable number.

34021861 is a deficient number, since it is larger than the sum of its proper divisors (1).

34021861 is an equidigital number, since it uses as much as digits as its factorization.

34021861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 34021861 is about 5832.8261589044. The cubic root of 34021861 is about 324.0305977556.

It can be divided in two parts, 340 and 21861, that added together give a square (22201 = 149²).

The spelling of 34021861 in words is "thirty-four million, twenty-one thousand, eight hundred sixty-one".