75217999081 has 3 divisors (see below), whose sum is σ = 75218273341. Its totient is φ = 75217724822.

The previous prime is 75217999079. The next prime is 75217999091. The reversal of 75217999081 is 18099971257.

The square root of 75217999081 is 274259.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18099971257 = 1997 ⋅9063581.

It is not a de Polignac number, because 75217999081 - 2¹ = 75217999079 is a prime.

It is a super-2 number, since 2×75217999081² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75217999091) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 137130 + ... + 411388.

Almost surely, 2^75217999081 is an apocalyptic number.

75217999081 is the 274259-th square number.

75217999081 is the 137130-th centered octagonal number.

It is an amenable number.

75217999081 is a deficient number, since it is larger than the sum of its proper divisors (274260).

75217999081 is an frugal number, since it uses more digits than its factorization.

75217999081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548518 (or 274259 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 58.

The spelling of 75217999081 in words is "seventy-five billion, two hundred seventeen million, nine hundred ninety-nine thousand, eighty-one".