1894579081 has 2 divisors, whose sum is σ = 1894579082. Its totient is φ = 1894579080.

The previous prime is 1894579067. The next prime is 1894579103. The reversal of 1894579081 is 1809754981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1412557056 + 482022025 = 37584^2 + 21955^2 .

It is an emirp because it is prime and its reverse (1809754981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1894579081 - 2⁷ = 1894578953 is a prime.

It is a super-2 number, since 2×1894579081² = 7178859788325609122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1894570081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 947289540 + 947289541.

It is an arithmetic number, because the mean of its divisors is an integer number (947289541).

Almost surely, 2^1894579081 is an apocalyptic number.

It is an amenable number.

1894579081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1894579081 is an equidigital number, since it uses as much as digits as its factorization.

1894579081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 52.

The square root of 1894579081 is about 43526.7628132394. The cubic root of 1894579081 is about 1237.3832872413.

Subtracting from 1894579081 its reverse (1809754981), we obtain a square (84824100 = 9210²).

The spelling of 1894579081 in words is "one billion, eight hundred ninety-four million, five hundred seventy-nine thousand, eighty-one".