65139069 has 4 divisors (see below), whose sum is σ = 86852096. Its totient is φ = 43426044.

The previous prime is 65139047. The next prime is 65139079. The reversal of 65139069 is 96093156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65139069 - 2²³ = 56750461 is a prime.

It is a super-2 number, since 2×65139069² = 8486196620373522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65139079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10856509 + ... + 10856514.

It is an arithmetic number, because the mean of its divisors is an integer number (21713024).

Almost surely, 2^65139069 is an apocalyptic number.

It is an amenable number.

65139069 is a deficient number, since it is larger than the sum of its proper divisors (21713027).

65139069 is a wasteful number, since it uses less digits than its factorization.

65139069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21713026.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 65139069 is about 8070.8778332967. The cubic root of 65139069 is about 402.3591194520.

The spelling of 65139069 in words is "sixty-five million, one hundred thirty-nine thousand, sixty-nine".