1361117081 has 2 divisors, whose sum is σ = 1361117082. Its totient is φ = 1361117080.

The previous prime is 1361117071. The next prime is 1361117089. The reversal of 1361117081 is 1807111631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002355600 + 358761481 = 31660^2 + 18941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1361117081 is a prime.

It is a super-2 number, since 2×1361117081² = 3705279416379921122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1361117089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680558540 + 680558541.

It is an arithmetic number, because the mean of its divisors is an integer number (680558541).

Almost surely, 2^1361117081 is an apocalyptic number.

It is an amenable number.

1361117081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361117081 is an equidigital number, since it uses as much as digits as its factorization.

1361117081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 1361117081 is about 36893.3202761692. The cubic root of 1361117081 is about 1108.2349137749.

The spelling of 1361117081 in words is "one billion, three hundred sixty-one million, one hundred seventeen thousand, eighty-one".