75423121 has 2 divisors, whose sum is σ = 75423122. Its totient is φ = 75423120.

The previous prime is 75423107. The next prime is 75423133. The reversal of 75423121 is 12132457.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69072721 + 6350400 = 8311^2 + 2520^2 .

It is an emirp because it is prime and its reverse (12132457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75423121 - 2⁷ = 75422993 is a prime.

It is not a weakly prime, because it can be changed into another prime (75453121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37711560 + 37711561.

It is an arithmetic number, because the mean of its divisors is an integer number (37711561).

Almost surely, 2^75423121 is an apocalyptic number.

It is an amenable number.

75423121 is a deficient number, since it is larger than the sum of its proper divisors (1).

75423121 is an equidigital number, since it uses as much as digits as its factorization.

75423121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 75423121 is about 8684.6485824125. The cubic root of 75423121 is about 422.5078994357.

Adding to 75423121 its reverse (12132457), we get a palindrome (87555578).

The spelling of 75423121 in words is "seventy-five million, four hundred twenty-three thousand, one hundred twenty-one".