69661939 has 4 divisors (see below), whose sum is σ = 70804000. Its totient is φ = 68519880.

The previous prime is 69661931. The next prime is 69661997. The reversal of 69661939 is 93916696.

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 69661939 - 2³ = 69661931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 69661892 and 69661901.

It is not an unprimeable number, because it can be changed into a prime (69661931) 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, 570939 + ... + 571060.

It is an arithmetic number, because the mean of its divisors is an integer number (17701000).

Almost surely, 2^69661939 is an apocalyptic number.

69661939 is a deficient number, since it is larger than the sum of its proper divisors (1142061).

69661939 is a wasteful number, since it uses less digits than its factorization.

69661939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142060.

The product of its digits is 472392, while the sum is 49.

The square root of 69661939 is about 8346.3728049974. The cubic root of 69661939 is about 411.4640086790.

The spelling of 69661939 in words is "sixty-nine million, six hundred sixty-one thousand, nine hundred thirty-nine".