75221545 has 8 divisors (see below), whose sum is σ = 103161024. Its totient is φ = 51580464.

The previous prime is 75221543. The next prime is 75221579. The reversal of 75221545 is 54512257.

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 75221545 - 2¹ = 75221543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75221543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1074559 + ... + 1074628.

It is an arithmetic number, because the mean of its divisors is an integer number (12895128).

Almost surely, 2^75221545 is an apocalyptic number.

It is an amenable number.

75221545 is a deficient number, since it is larger than the sum of its proper divisors (27939479).

75221545 is a wasteful number, since it uses less digits than its factorization.

75221545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149199.

The product of its digits is 14000, while the sum is 31.

The square root of 75221545 is about 8673.0355124374. The cubic root of 75221545 is about 422.1311651002.

The spelling of 75221545 in words is "seventy-five million, two hundred twenty-one thousand, five hundred forty-five".