69145939 has 4 divisors (see below), whose sum is σ = 69245280. Its totient is φ = 69046600.

The previous prime is 69145927. The next prime is 69145957. The reversal of 69145939 is 93954196.

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

It is a cyclic number.

It is not a de Polignac number, because 69145939 - 2⁵ = 69145907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69148939) 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 in 3 ways as a sum of consecutive naturals, for example, 48619 + ... + 50020.

It is an arithmetic number, because the mean of its divisors is an integer number (17311320).

Almost surely, 2^69145939 is an apocalyptic number.

69145939 is a deficient number, since it is larger than the sum of its proper divisors (99341).

69145939 is an equidigital number, since it uses as much as digits as its factorization.

69145939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99340.

The product of its digits is 262440, while the sum is 46.

The square root of 69145939 is about 8315.4037184012. The cubic root of 69145939 is about 410.4455576640.

The spelling of 69145939 in words is "sixty-nine million, one hundred forty-five thousand, nine hundred thirty-nine".