75181945 has 8 divisors (see below), whose sum is σ = 91062144. Its totient is φ = 59583024.

The previous prime is 75181943. The next prime is 75181961. The reversal of 75181945 is 54918157.

75181945 = 315² + 316² + ... + 635².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75181945 - 2¹ = 75181943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75181898 and 75181907.

It is not an unprimeable number, because it can be changed into a prime (75181943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69729 + ... + 70798.

It is an arithmetic number, because the mean of its divisors is an integer number (11382768).

Almost surely, 2^75181945 is an apocalyptic number.

It is an amenable number.

75181945 is a deficient number, since it is larger than the sum of its proper divisors (15880199).

75181945 is a wasteful number, since it uses less digits than its factorization.

75181945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140639.

The product of its digits is 50400, while the sum is 40.

The square root of 75181945 is about 8670.7522741686. The cubic root of 75181945 is about 422.0570758287.

The spelling of 75181945 in words is "seventy-five million, one hundred eighty-one thousand, nine hundred forty-five".