2081311493 has 2 divisors, whose sum is σ = 2081311494. Its totient is φ = 2081311492.

The previous prime is 2081311489. The next prime is 2081311523. The reversal of 2081311493 is 3941131802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2025630049 + 55681444 = 45007^2 + 7462^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081311493 - 2² = 2081311489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081311483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040655746 + 1040655747.

It is an arithmetic number, because the mean of its divisors is an integer number (1040655747).

Almost surely, 2^2081311493 is an apocalyptic number.

It is an amenable number.

2081311493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081311493 is an equidigital number, since it uses as much as digits as its factorization.

2081311493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2081311493 is about 45621.3929313869. The cubic root of 2081311493 is about 1276.7690921769.

The spelling of 2081311493 in words is "two billion, eighty-one million, three hundred eleven thousand, four hundred ninety-three".