73653121 has 4 divisors (see below), whose sum is σ = 74540592. Its totient is φ = 72765652.

The previous prime is 73653103. The next prime is 73653133. The reversal of 73653121 is 12135637.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12135637 = 17 ⋅713861.

It is a cyclic number.

It is not a de Polignac number, because 73653121 - 2¹¹ = 73651073 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 73653121.

It is not an unprimeable number, because it can be changed into a prime (73653221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443611 + ... + 443776.

It is an arithmetic number, because the mean of its divisors is an integer number (18635148).

Almost surely, 2^73653121 is an apocalyptic number.

It is an amenable number.

73653121 is a deficient number, since it is larger than the sum of its proper divisors (887471).

73653121 is an equidigital number, since it uses as much as digits as its factorization.

73653121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887470.

The product of its digits is 3780, while the sum is 28.

The square root of 73653121 is about 8582.1396516253. The cubic root of 73653121 is about 419.1766200595.

Adding to 73653121 its reverse (12135637), we get a palindrome (85788758).

The spelling of 73653121 in words is "seventy-three million, six hundred fifty-three thousand, one hundred twenty-one".