69485281 has 4 divisors (see below), whose sum is σ = 69504532. Its totient is φ = 69466032.

The previous prime is 69485263. The next prime is 69485287. The reversal of 69485281 is 18258496.

It is a happy number.

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 43678881 + 25806400 = 6609^2 + 5080^2 .

It is a 3-Lehmer number, since φ(69485281) divides (69485281-1)³.

It is a cyclic number.

It is not a de Polignac number, because 69485281 - 2⁷ = 69485153 is a prime.

It is a super-2 number, since 2×69485281² = 9656408551297922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69485287) 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, 2406 + ... + 12031.

It is an arithmetic number, because the mean of its divisors is an integer number (17376133).

It is a Poulet number, since it divides 2^69485280-1.

Almost surely, 2^69485281 is an apocalyptic number.

69485281 is the 4813-rd octagonal number.

It is an amenable number.

69485281 is a deficient number, since it is larger than the sum of its proper divisors (19251).

69485281 is a wasteful number, since it uses less digits than its factorization.

69485281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19250.

The product of its digits is 138240, while the sum is 43.

The square root of 69485281 is about 8335.7831665657. The cubic root of 69485281 is about 411.1158992192.

The spelling of 69485281 in words is "sixty-nine million, four hundred eighty-five thousand, two hundred eighty-one".