34623621581 has 2 divisors, whose sum is σ = 34623621582. Its totient is φ = 34623621580.

The previous prime is 34623621559. The next prime is 34623621667. The reversal of 34623621581 is 18512632643.

34623621581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20388984100 + 14234637481 = 142790^2 + 119309^2 .

It is an emirp because it is prime and its reverse (18512632643) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34623621581 - 2²⁶ = 34556512717 is a prime.

It is a super-2 number, since 2×34623621581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34623621521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17311810790 + 17311810791.

It is an arithmetic number, because the mean of its divisors is an integer number (17311810791).

Almost surely, 2^34623621581 is an apocalyptic number.

It is an amenable number.

34623621581 is a deficient number, since it is larger than the sum of its proper divisors (1).

34623621581 is an equidigital number, since it uses as much as digits as its factorization.

34623621581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 41.

The spelling of 34623621581 in words is "thirty-four billion, six hundred twenty-three million, six hundred twenty-one thousand, five hundred eighty-one".