69690581 has 2 divisors, whose sum is σ = 69690582. Its totient is φ = 69690580.

The previous prime is 69690553. The next prime is 69690583. The reversal of 69690581 is 18509696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58767556 + 10923025 = 7666^2 + 3305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69690581 is a prime.

It is a super-2 number, since 2×69690581² = 9713554160235122, which contains 22 as substring.

Together with 69690583, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69690583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34845290 + 34845291.

It is an arithmetic number, because the mean of its divisors is an integer number (34845291).

Almost surely, 2^69690581 is an apocalyptic number.

It is an amenable number.

69690581 is a deficient number, since it is larger than the sum of its proper divisors (1).

69690581 is an equidigital number, since it uses as much as digits as its factorization.

69690581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 69690581 is about 8348.0884638341. The cubic root of 69690581 is about 411.5203930667.

The spelling of 69690581 in words is "sixty-nine million, six hundred ninety thousand, five hundred eighty-one".