765105121 has 4 divisors (see below), whose sum is σ = 834660144. Its totient is φ = 695550100.

The previous prime is 765105119. The next prime is 765105139. The reversal of 765105121 is 121501567.

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 a cyclic number.

It is not a de Polignac number, because 765105121 - 2¹ = 765105119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 765105121.

It is not an unprimeable number, because it can be changed into a prime (765105101) 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, 34777495 + ... + 34777516.

It is an arithmetic number, because the mean of its divisors is an integer number (208665036).

Almost surely, 2^765105121 is an apocalyptic number.

It is an amenable number.

765105121 is a deficient number, since it is larger than the sum of its proper divisors (69555023).

765105121 is a wasteful number, since it uses less digits than its factorization.

765105121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69555022.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 765105121 is about 27660.5336354887. The cubic root of 765105121 is about 914.6193170897.

Adding to 765105121 its reverse (121501567), we get a palindrome (886606688).

The spelling of 765105121 in words is "seven hundred sixty-five million, one hundred five thousand, one hundred twenty-one".