75521997 has 16 divisors (see below), whose sum is σ = 114266880. Its totient is φ = 49275936.

The previous prime is 75521989. The next prime is 75522001. The reversal of 75521997 is 79912557.

75521997 is a `hidden beast` number, since 7 + 552 + 1 + 9 + 97 = 666.

It is not a de Polignac number, because 75521997 - 2³ = 75521989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75521917) 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, 28488 + ... + 31025.

It is an arithmetic number, because the mean of its divisors is an integer number (7141680).

Almost surely, 2^75521997 is an apocalyptic number.

It is an amenable number.

75521997 is a deficient number, since it is larger than the sum of its proper divisors (38744883).

75521997 is a wasteful number, since it uses less digits than its factorization.

75521997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59569 (or 59563 counting only the distinct ones).

The product of its digits is 198450, while the sum is 45.

The square root of 75521997 is about 8690.3392914201. The cubic root of 75521997 is about 422.6924478359.

The spelling of 75521997 in words is "seventy-five million, five hundred twenty-one thousand, nine hundred ninety-seven".