75495781 has 2 divisors, whose sum is σ = 75495782. Its totient is φ = 75495780.

The previous prime is 75495743. The next prime is 75495829. The reversal of 75495781 is 18759457.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74909025 + 586756 = 8655^2 + 766^2 .

It is an emirp because it is prime and its reverse (18759457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75495781 - 2⁷ = 75495653 is a prime.

It is a super-2 number, since 2×75495781² = 11399225897599922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75495731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37747890 + 37747891.

It is an arithmetic number, because the mean of its divisors is an integer number (37747891).

Almost surely, 2^75495781 is an apocalyptic number.

It is an amenable number.

75495781 is a deficient number, since it is larger than the sum of its proper divisors (1).

75495781 is an equidigital number, since it uses as much as digits as its factorization.

75495781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 46.

The square root of 75495781 is about 8688.8308189307. The cubic root of 75495781 is about 422.6435323406.

The spelling of 75495781 in words is "seventy-five million, four hundred ninety-five thousand, seven hundred eighty-one".