1340555081 has 2 divisors, whose sum is σ = 1340555082. Its totient is φ = 1340555080.

The previous prime is 1340555053. The next prime is 1340555173. The reversal of 1340555081 is 1805550431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1001406025 + 339149056 = 31645^2 + 18416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340555081 is a prime.

It is a super-2 number, since 2×1340555081² = 3594175850389833122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1340555011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670277540 + 670277541.

It is an arithmetic number, because the mean of its divisors is an integer number (670277541).

Almost surely, 2^1340555081 is an apocalyptic number.

It is an amenable number.

1340555081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340555081 is an equidigital number, since it uses as much as digits as its factorization.

1340555081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 1340555081 is about 36613.5914791215. The cubic root of 1340555081 is about 1102.6259798486.

It can be divided in two parts, 13405 and 55081, that added together give a palindrome (68486).

The spelling of 1340555081 in words is "one billion, three hundred forty million, five hundred fifty-five thousand, eighty-one".