34181981 has 4 divisors (see below), whose sum is σ = 35360700. Its totient is φ = 33003264.

The previous prime is 34181977. The next prime is 34182011. The reversal of 34181981 is 18918143.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18705625 + 15476356 = 4325^2 + 3934^2 .

It is a cyclic number.

It is not a de Polignac number, because 34181981 - 2² = 34181977 is a prime.

It is a super-2 number, since 2×34181981² = 2336815650168722, 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 (34181681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589316 + ... + 589373.

It is an arithmetic number, because the mean of its divisors is an integer number (8840175).

Almost surely, 2^34181981 is an apocalyptic number.

It is an amenable number.

34181981 is a deficient number, since it is larger than the sum of its proper divisors (1178719).

34181981 is a wasteful number, since it uses less digits than its factorization.

34181981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178718.

The product of its digits is 6912, while the sum is 35.

The square root of 34181981 is about 5846.5358119146. The cubic root of 34181981 is about 324.5381400134.

The spelling of 34181981 in words is "thirty-four million, one hundred eighty-one thousand, nine hundred eighty-one".