73890121 has 2 divisors, whose sum is σ = 73890122. Its totient is φ = 73890120.

The previous prime is 73890101. The next prime is 73890137. The reversal of 73890121 is 12109837.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49000000 + 24890121 = 7000^2 + 4989^2 .

It is a cyclic number.

It is not a de Polignac number, because 73890121 - 2²¹ = 71792969 is a prime.

It is not a weakly prime, because it can be changed into another prime (73890101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36945060 + 36945061.

It is an arithmetic number, because the mean of its divisors is an integer number (36945061).

Almost surely, 2^73890121 is an apocalyptic number.

It is an amenable number.

73890121 is a deficient number, since it is larger than the sum of its proper divisors (1).

73890121 is an equidigital number, since it uses as much as digits as its factorization.

73890121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 73890121 is about 8595.9363073490. The cubic root of 73890121 is about 419.6257455949.

Adding to 73890121 its reverse (12109837), we get a palindrome (85999958).

The spelling of 73890121 in words is "seventy-three million, eight hundred ninety thousand, one hundred twenty-one".