69085921 has 4 divisors (see below), whose sum is σ = 69236244. Its totient is φ = 68935600.

The previous prime is 69085897. The next prime is 69085927. The reversal of 69085921 is 12958096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19580625 + 49505296 = 4425^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 69085921 - 2⁵ = 69085889 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69085927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74470 + ... + 75391.

It is an arithmetic number, because the mean of its divisors is an integer number (17309061).

Almost surely, 2^69085921 is an apocalyptic number.

It is an amenable number.

69085921 is a deficient number, since it is larger than the sum of its proper divisors (150323).

69085921 is a wasteful number, since it uses less digits than its factorization.

69085921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150322.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 69085921 is about 8311.7940903273. The cubic root of 69085921 is about 410.3267690426.

The spelling of 69085921 in words is "sixty-nine million, eighty-five thousand, nine hundred twenty-one".