1493611081 has 2 divisors, whose sum is σ = 1493611082. Its totient is φ = 1493611080.

The previous prime is 1493611069. The next prime is 1493611087. The reversal of 1493611081 is 1801163941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1329258681 + 164352400 = 36459^2 + 12820^2 .

It is an emirp because it is prime and its reverse (1801163941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1493611081 - 2²⁷ = 1359393353 is a prime.

It is a super-3 number, since 3×1493611081³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1493611087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 746805540 + 746805541.

It is an arithmetic number, because the mean of its divisors is an integer number (746805541).

Almost surely, 2^1493611081 is an apocalyptic number.

It is an amenable number.

1493611081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1493611081 is an equidigital number, since it uses as much as digits as its factorization.

1493611081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 1493611081 is about 38647.2648579431. The cubic root of 1493611081 is about 1143.0867104183.

The spelling of 1493611081 in words is "one billion, four hundred ninety-three million, six hundred eleven thousand, eighty-one".