73121299 has 4 divisors (see below), whose sum is σ = 73185336. Its totient is φ = 73057264.

The previous prime is 73121263. The next prime is 73121309. The reversal of 73121299 is 99212137.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99212137 = 43 ⋅2307259.

It is a cyclic number.

It is not a de Polignac number, because 73121299 - 2⁷ = 73121171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73121239) 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, 30274 + ... + 32599.

It is an arithmetic number, because the mean of its divisors is an integer number (18296334).

Almost surely, 2^73121299 is an apocalyptic number.

73121299 is a deficient number, since it is larger than the sum of its proper divisors (64037).

73121299 is a wasteful number, since it uses less digits than its factorization.

73121299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64036.

The product of its digits is 6804, while the sum is 34.

The square root of 73121299 is about 8551.0992860567. The cubic root of 73121299 is about 418.1652754082.

The spelling of 73121299 in words is "seventy-three million, one hundred twenty-one thousand, two hundred ninety-nine".