75505121 has 2 divisors, whose sum is σ = 75505122. Its totient is φ = 75505120.

The previous prime is 75505117. The next prime is 75505127. The reversal of 75505121 is 12150557.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75498721 + 6400 = 8689^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 75505121 - 2² = 75505117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75505127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37752560 + 37752561.

It is an arithmetic number, because the mean of its divisors is an integer number (37752561).

Almost surely, 2^75505121 is an apocalyptic number.

It is an amenable number.

75505121 is a deficient number, since it is larger than the sum of its proper divisors (1).

75505121 is an equidigital number, since it uses as much as digits as its factorization.

75505121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 75505121 is about 8689.3682739311. The cubic root of 75505121 is about 422.6609608103.

Adding to 75505121 its reverse (12150557), we get a palindrome (87655678).

The spelling of 75505121 in words is "seventy-five million, five hundred five thousand, one hundred twenty-one".