73878121 has 2 divisors, whose sum is σ = 73878122. Its totient is φ = 73878120.

The previous prime is 73878113. The next prime is 73878143. The reversal of 73878121 is 12187837.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73874025 + 4096 = 8595^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 73878121 - 2³ = 73878113 is a prime.

It is not a weakly prime, because it can be changed into another prime (73878221) 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 as a sum of consecutive naturals, namely, 36939060 + 36939061.

It is an arithmetic number, because the mean of its divisors is an integer number (36939061).

Almost surely, 2^73878121 is an apocalyptic number.

It is an amenable number.

73878121 is a deficient number, since it is larger than the sum of its proper divisors (1).

73878121 is an equidigital number, since it uses as much as digits as its factorization.

73878121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 37.

The square root of 73878121 is about 8595.2382747659. The cubic root of 73878121 is about 419.6030281621.

The spelling of 73878121 in words is "seventy-three million, eight hundred seventy-eight thousand, one hundred twenty-one".