73561121 has 2 divisors, whose sum is σ = 73561122. Its totient is φ = 73561120.

The previous prime is 73561073. The next prime is 73561123. The reversal of 73561121 is 12116537.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73290721 + 270400 = 8561^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 73561121 - 2¹⁸ = 73298977 is a prime.

It is a super-2 number, since 2×73561121² = 10822477045553282, which contains 22 as substring.

Together with 73561123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73561123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36780560 + 36780561.

It is an arithmetic number, because the mean of its divisors is an integer number (36780561).

Almost surely, 2^73561121 is an apocalyptic number.

It is an amenable number.

73561121 is a deficient number, since it is larger than the sum of its proper divisors (1).

73561121 is an equidigital number, since it uses as much as digits as its factorization.

73561121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 73561121 is about 8576.7780080867. The cubic root of 73561121 is about 419.0020163835.

Adding to 73561121 its reverse (12116537), we get a palindrome (85677658).

The spelling of 73561121 in words is "seventy-three million, five hundred sixty-one thousand, one hundred twenty-one".