65273121 has 20 divisors (see below), whose sum is σ = 97828500. Its totient is φ = 43371936.

The previous prime is 65273099. The next prime is 65273123. The reversal of 65273121 is 12137256.

It is a happy number.

65273121 is a `hidden beast` number, since 652 + 7 + 3 + 1 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51322896 + 13950225 = 7164^2 + 3735^2 .

It is not a de Polignac number, because 65273121 - 2²⁵ = 31718689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (65273123) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27115 + ... + 29423.

It is an arithmetic number, because the mean of its divisors is an integer number (4891425).

Almost surely, 2^65273121 is an apocalyptic number.

It is an amenable number.

65273121 is a deficient number, since it is larger than the sum of its proper divisors (32555379).

65273121 is a wasteful number, since it uses less digits than its factorization.

65273121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670 (or 2661 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 65273121 is about 8079.1782379150. The cubic root of 65273121 is about 402.6349400314.

The spelling of 65273121 in words is "sixty-five million, two hundred seventy-three thousand, one hundred twenty-one".