75404821 has 2 divisors, whose sum is σ = 75404822. Its totient is φ = 75404820.

The previous prime is 75404767. The next prime is 75404827. The reversal of 75404821 is 12840457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67486225 + 7918596 = 8215^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 75404821 - 2¹⁷ = 75273749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75404827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37702410 + 37702411.

It is an arithmetic number, because the mean of its divisors is an integer number (37702411).

Almost surely, 2^75404821 is an apocalyptic number.

It is an amenable number.

75404821 is a deficient number, since it is larger than the sum of its proper divisors (1).

75404821 is an equidigital number, since it uses as much as digits as its factorization.

75404821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 75404821 is about 8683.5949352788. The cubic root of 75404821 is about 422.4737254765.

The spelling of 75404821 in words is "seventy-five million, four hundred four thousand, eight hundred twenty-one".