69145 has 4 divisors (see below), whose sum is σ = 82980. Its totient is φ = 55312.

The previous prime is 69143. The next prime is 69149. The reversal of 69145 is 54196.

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 17161 + 51984 = 131^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 69145 - 2¹ = 69143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6910 + ... + 6919.

It is an arithmetic number, because the mean of its divisors is an integer number (20745).

2⁶⁹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

69145 is a deficient number, since it is larger than the sum of its proper divisors (13835).

69145 is a wasteful number, since it uses less digits than its factorization.

69145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13834.

The product of its digits is 1080, while the sum is 25.

The square root of 69145 is about 262.9543686650. The cubic root of 69145 is about 41.0443699709.

Adding to 69145 its product of digits (1080), we get a square (70225 = 265²).

The spelling of 69145 in words is "sixty-nine thousand, one hundred forty-five".