73732121 has 4 divisors (see below), whose sum is σ = 74462244. Its totient is φ = 73002000.

The previous prime is 73732091. The next prime is 73732129. The reversal of 73732121 is 12123737.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56625625 + 17106496 = 7525^2 + 4136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73732121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73732129) 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, 364910 + ... + 365111.

It is an arithmetic number, because the mean of its divisors is an integer number (18615561).

Almost surely, 2^73732121 is an apocalyptic number.

It is an amenable number.

73732121 is a deficient number, since it is larger than the sum of its proper divisors (730123).

73732121 is a wasteful number, since it uses less digits than its factorization.

73732121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730122.

The product of its digits is 1764, while the sum is 26.

The square root of 73732121 is about 8586.7409999371. The cubic root of 73732121 is about 419.3264354823.

Adding to 73732121 its reverse (12123737), we get a palindrome (85855858).

The spelling of 73732121 in words is "seventy-three million, seven hundred thirty-two thousand, one hundred twenty-one".