75121905 has 16 divisors (see below), whose sum is σ = 121889664. Its totient is φ = 39500160.

The previous prime is 75121873. The next prime is 75121909. The reversal of 75121905 is 50912157.

It is not a de Polignac number, because 75121905 - 2⁵ = 75121873 is a prime.

It is a super-2 number, since 2×75121905² = 11286601221658050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (75121909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34204 + ... + 36333.

It is an arithmetic number, because the mean of its divisors is an integer number (7618104).

Almost surely, 2^75121905 is an apocalyptic number.

It is an amenable number.

75121905 is a deficient number, since it is larger than the sum of its proper divisors (46767759).

75121905 is a wasteful number, since it uses less digits than its factorization.

75121905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70616.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 75121905 is about 8667.2893686550. The cubic root of 75121905 is about 421.9446948779.

The spelling of 75121905 in words is "seventy-five million, one hundred twenty-one thousand, nine hundred five".