34945781 has 4 divisors (see below), whose sum is σ = 37633932. Its totient is φ = 32257632.

The previous prime is 34945777. The next prime is 34945787. The reversal of 34945781 is 18754943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18754943 = 163 ⋅115061.

It can be written as a sum of positive squares in 2 ways, for example, as 15673681 + 19272100 = 3959^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 34945781 - 2² = 34945777 is a prime.

It is a super-2 number, since 2×34945781² = 2442415219399922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34945787) 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, 1344056 + ... + 1344081.

It is an arithmetic number, because the mean of its divisors is an integer number (9408483).

Almost surely, 2^34945781 is an apocalyptic number.

It is an amenable number.

34945781 is a deficient number, since it is larger than the sum of its proper divisors (2688151).

34945781 is a wasteful number, since it uses less digits than its factorization.

34945781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688150.

The product of its digits is 120960, while the sum is 41.

The square root of 34945781 is about 5911.4956652272. The cubic root of 34945781 is about 326.9376352058.

The spelling of 34945781 in words is "thirty-four million, nine hundred forty-five thousand, seven hundred eighty-one".