73737221 has 2 divisors, whose sum is σ = 73737222. Its totient is φ = 73737220.

The previous prime is 73737199. The next prime is 73737239. The reversal of 73737221 is 12273737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68724100 + 5013121 = 8290^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 73737221 - 2²⁶ = 6628357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73737281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36868610 + 36868611.

It is an arithmetic number, because the mean of its divisors is an integer number (36868611).

Almost surely, 2^73737221 is an apocalyptic number.

It is an amenable number.

73737221 is a deficient number, since it is larger than the sum of its proper divisors (1).

73737221 is an equidigital number, since it uses as much as digits as its factorization.

73737221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12348, while the sum is 32.

The square root of 73737221 is about 8587.0379642808. The cubic root of 73737221 is about 419.3361034329.

The spelling of 73737221 in words is "seventy-three million, seven hundred thirty-seven thousand, two hundred twenty-one".