34643981 has 4 divisors (see below), whose sum is σ = 34656000. Its totient is φ = 34631964.

The previous prime is 34643971. The next prime is 34643993. The reversal of 34643981 is 18934643.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-34643981 is a prime.

It is a super-2 number, since 2×34643981² = 2400410839056722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34643971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190 + ... + 8408.

It is an arithmetic number, because the mean of its divisors is an integer number (8664000).

Almost surely, 2^34643981 is an apocalyptic number.

It is an amenable number.

34643981 is a deficient number, since it is larger than the sum of its proper divisors (12019).

34643981 is an equidigital number, since it uses as much as digits as its factorization.

34643981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12018.

The product of its digits is 62208, while the sum is 38.

The square root of 34643981 is about 5885.9137778258. The cubic root of 34643981 is about 325.9937425876.

The spelling of 34643981 in words is "thirty-four million, six hundred forty-three thousand, nine hundred eighty-one".