75415121 has 2 divisors, whose sum is σ = 75415122. Its totient is φ = 75415120.

The previous prime is 75415099. The next prime is 75415141. The reversal of 75415121 is 12151457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51051025 + 24364096 = 7145^2 + 4936^2 .

It is a cyclic number.

It is not a de Polignac number, because 75415121 - 2⁶ = 75415057 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 (75415141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37707560 + 37707561.

It is an arithmetic number, because the mean of its divisors is an integer number (37707561).

Almost surely, 2^75415121 is an apocalyptic number.

It is an amenable number.

75415121 is a deficient number, since it is larger than the sum of its proper divisors (1).

75415121 is an equidigital number, since it uses as much as digits as its factorization.

75415121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 26.

The square root of 75415121 is about 8684.1879873711. The cubic root of 75415121 is about 422.4929606801.

Adding to 75415121 its reverse (12151457), we get a palindrome (87566578).

The spelling of 75415121 in words is "seventy-five million, four hundred fifteen thousand, one hundred twenty-one".