75916121 has 2 divisors, whose sum is σ = 75916122. Its totient is φ = 75916120.

The previous prime is 75916103. The next prime is 75916129. The reversal of 75916121 is 12161957.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 18156121 = 7600^2 + 4261^2 .

It is a cyclic number.

It is not a de Polignac number, because 75916121 - 2¹⁰ = 75915097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (75916129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37958060 + 37958061.

It is an arithmetic number, because the mean of its divisors is an integer number (37958061).

Almost surely, 2^75916121 is an apocalyptic number.

It is an amenable number.

75916121 is a deficient number, since it is larger than the sum of its proper divisors (1).

75916121 is an equidigital number, since it uses as much as digits as its factorization.

75916121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 32.

The square root of 75916121 is about 8712.9857683804. The cubic root of 75916121 is about 423.4264691988.

The spelling of 75916121 in words is "seventy-five million, nine hundred sixteen thousand, one hundred twenty-one".