34397981 has 2 divisors, whose sum is σ = 34397982. Its totient is φ = 34397980.

The previous prime is 34397977. The next prime is 34397989. The reversal of 34397981 is 18979343.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21473956 + 12924025 = 4634^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 34397981 - 2² = 34397977 is a prime.

It is a super-2 number, since 2×34397981² = 2366442193752722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34397989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17198990 + 17198991.

It is an arithmetic number, because the mean of its divisors is an integer number (17198991).

Almost surely, 2^34397981 is an apocalyptic number.

It is an amenable number.

34397981 is a deficient number, since it is larger than the sum of its proper divisors (1).

34397981 is an equidigital number, since it uses as much as digits as its factorization.

34397981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 34397981 is about 5864.9791985991. The cubic root of 34397981 is about 325.2203034920.

The spelling of 34397981 in words is "thirty-four million, three hundred ninety-seven thousand, nine hundred eighty-one".