69768521 has 2 divisors, whose sum is σ = 69768522. Its totient is φ = 69768520.

The previous prime is 69768497. The next prime is 69768529. The reversal of 69768521 is 12586796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69222400 + 546121 = 8320^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 69768521 - 2¹⁰ = 69767497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (69768529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34884260 + 34884261.

It is an arithmetic number, because the mean of its divisors is an integer number (34884261).

Almost surely, 2^69768521 is an apocalyptic number.

It is an amenable number.

69768521 is a deficient number, since it is larger than the sum of its proper divisors (1).

69768521 is an equidigital number, since it uses as much as digits as its factorization.

69768521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 69768521 is about 8352.7552939135. The cubic root of 69768521 is about 411.6737468846.

The spelling of 69768521 in words is "sixty-nine million, seven hundred sixty-eight thousand, five hundred twenty-one".