75899521 has 2 divisors, whose sum is σ = 75899522. Its totient is φ = 75899520.

The previous prime is 75899519. The next prime is 75899533. The reversal of 75899521 is 12599857.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73616400 + 2283121 = 8580^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 75899521 - 2¹ = 75899519 is a prime.

Together with 75899519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (75899561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37949760 + 37949761.

It is an arithmetic number, because the mean of its divisors is an integer number (37949761).

Almost surely, 2^75899521 is an apocalyptic number.

It is an amenable number.

75899521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75899521 is an equidigital number, since it uses as much as digits as its factorization.

75899521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 46.

The square root of 75899521 is about 8712.0331151804. The cubic root of 75899521 is about 423.3956044686.

The spelling of 75899521 in words is "seventy-five million, eight hundred ninety-nine thousand, five hundred twenty-one".