73121251 has 8 divisors (see below), whose sum is σ = 83636480. Its totient is φ = 62623368.

The previous prime is 73121239. The next prime is 73121261. The reversal of 73121251 is 15212137.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73121251 - 2⁷ = 73121123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6520 + ... + 13738.

It is an arithmetic number, because the mean of its divisors is an integer number (10454560).

Almost surely, 2^73121251 is an apocalyptic number.

73121251 is a deficient number, since it is larger than the sum of its proper divisors (10515229).

73121251 is a wasteful number, since it uses less digits than its factorization.

73121251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8673.

The product of its digits is 420, while the sum is 22.

The square root of 73121251 is about 8551.0964793996. The cubic root of 73121251 is about 418.1651839076.

Adding to 73121251 its reverse (15212137), we get a palindrome (88333388).

The spelling of 73121251 in words is "seventy-three million, one hundred twenty-one thousand, two hundred fifty-one".