75817481 has 2 divisors, whose sum is σ = 75817482. Its totient is φ = 75817480.

The previous prime is 75817459. The next prime is 75817493. The reversal of 75817481 is 18471857.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 4583881 = 8440^2 + 2141^2 .

It is a cyclic number.

It is not a de Polignac number, because 75817481 - 2¹⁰ = 75816457 is a prime.

It is a super-2 number, since 2×75817481² = 11496580850370722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75817451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37908740 + 37908741.

It is an arithmetic number, because the mean of its divisors is an integer number (37908741).

Almost surely, 2^75817481 is an apocalyptic number.

It is an amenable number.

75817481 is a deficient number, since it is larger than the sum of its proper divisors (1).

75817481 is an equidigital number, since it uses as much as digits as its factorization.

75817481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 41.

The square root of 75817481 is about 8707.3234119332. The cubic root of 75817481 is about 423.2429996492.

The spelling of 75817481 in words is "seventy-five million, eight hundred seventeen thousand, four hundred eighty-one".