94778581 has 2 divisors, whose sum is σ = 94778582. Its totient is φ = 94778580.

The previous prime is 94778573. The next prime is 94778599. The reversal of 94778581 is 18587749.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84474481 + 10304100 = 9191^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 94778581 - 2³ = 94778573 is a prime.

It is a super-2 number, since 2×94778581² = 17965958832747122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (94778081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47389290 + 47389291.

It is an arithmetic number, because the mean of its divisors is an integer number (47389291).

Almost surely, 2^94778581 is an apocalyptic number.

It is an amenable number.

94778581 is a deficient number, since it is larger than the sum of its proper divisors (1).

94778581 is an equidigital number, since it uses as much as digits as its factorization.

94778581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The square root of 94778581 is about 9735.4291636270. The cubic root of 94778581 is about 455.9354918623.

It can be divided in two parts, 94778 and 581, that added together give a palindrome (95359).

The spelling of 94778581 in words is "ninety-four million, seven hundred seventy-eight thousand, five hundred eighty-one".