73781121 has 4 divisors (see below), whose sum is σ = 98374832. Its totient is φ = 49187412.

The previous prime is 73781087. The next prime is 73781131. The reversal of 73781121 is 12118737.

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 73781121 - 2¹³ = 73772929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73781131) 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, 12296851 + ... + 12296856.

It is an arithmetic number, because the mean of its divisors is an integer number (24593708).

Almost surely, 2^73781121 is an apocalyptic number.

It is an amenable number.

73781121 is a deficient number, since it is larger than the sum of its proper divisors (24593711).

73781121 is a wasteful number, since it uses less digits than its factorization.

73781121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24593710.

The product of its digits is 2352, while the sum is 30.

The square root of 73781121 is about 8589.5937622218. The cubic root of 73781121 is about 419.4193052073.

Adding to 73781121 its reverse (12118737), we get a palindrome (85899858).

The spelling of 73781121 in words is "seventy-three million, seven hundred eighty-one thousand, one hundred twenty-one".