8940735581 has 2 divisors, whose sum is σ = 8940735582. Its totient is φ = 8940735580.

The previous prime is 8940735577. The next prime is 8940735607. The reversal of 8940735581 is 1855370498.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8922502681 + 18232900 = 94459^2 + 4270^2 .

It is a cyclic number.

It is not a de Polignac number, because 8940735581 - 2² = 8940735577 is a prime.

It is a super-2 number, since 2×8940735581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8940735511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4470367790 + 4470367791.

It is an arithmetic number, because the mean of its divisors is an integer number (4470367791).

Almost surely, 2^8940735581 is an apocalyptic number.

It is an amenable number.

8940735581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8940735581 is an equidigital number, since it uses as much as digits as its factorization.

8940735581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The square root of 8940735581 is about 94555.4629886608. The cubic root of 8940735581 is about 2075.5080252972.

The spelling of 8940735581 in words is "eight billion, nine hundred forty million, seven hundred thirty-five thousand, five hundred eighty-one".