69681613 has 2 divisors, whose sum is σ = 69681614. Its totient is φ = 69681612.

The previous prime is 69681593. The next prime is 69681631. The reversal of 69681613 is 31618696.

Together with next prime (69681631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58936329 + 10745284 = 7677^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 69681613 - 2¹⁷ = 69550541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69681643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34840806 + 34840807.

It is an arithmetic number, because the mean of its divisors is an integer number (34840807).

Almost surely, 2^69681613 is an apocalyptic number.

It is an amenable number.

69681613 is a deficient number, since it is larger than the sum of its proper divisors (1).

69681613 is an equidigital number, since it uses as much as digits as its factorization.

69681613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 69681613 is about 8347.5513176021. The cubic root of 69681613 is about 411.5027404028.

The spelling of 69681613 in words is "sixty-nine million, six hundred eighty-one thousand, six hundred thirteen".