6940193521 has 2 divisors, whose sum is σ = 6940193522. Its totient is φ = 6940193520.

The previous prime is 6940193501. The next prime is 6940193569. The reversal of 6940193521 is 1253910496.

6940193521 is digitally balanced in base 3, 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., 4756033296 + 2184160225 = 68964^2 + 46735^2 .

It is a cyclic number.

It is not a de Polignac number, because 6940193521 - 2¹¹ = 6940191473 is a prime.

It is a super-2 number, since 2×6940193521² = 96332572217860754882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6940193501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3470096760 + 3470096761.

It is an arithmetic number, because the mean of its divisors is an integer number (3470096761).

Almost surely, 2^6940193521 is an apocalyptic number.

It is an amenable number.

6940193521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6940193521 is an equidigital number, since it uses as much as digits as its factorization.

6940193521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 6940193521 is about 83307.8238882759. The cubic root of 6940193521 is about 1907.4677040544.

The spelling of 6940193521 in words is "six billion, nine hundred forty million, one hundred ninety-three thousand, five hundred twenty-one".