1345715857 has 2 divisors, whose sum is σ = 1345715858. Its totient is φ = 1345715856.

The previous prime is 1345715849. The next prime is 1345715881. The reversal of 1345715857 is 7585175431.

It is a Cunningham number, because it is equal to 36684²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345715856 + 1 = 36684^2 + 1^2 .

It is an emirp because it is prime and its reverse (7585175431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1345715857 - 2³ = 1345715849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1345715827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672857928 + 672857929.

It is an arithmetic number, because the mean of its divisors is an integer number (672857929).

Almost surely, 2^1345715857 is an apocalyptic number.

It is an amenable number.

1345715857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345715857 is an equidigital number, since it uses as much as digits as its factorization.

1345715857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 588000, while the sum is 46.

The square root of 1345715857 is about 36684.0000136299. Note that the first 4 decimals coincide. The cubic root of 1345715857 is about 1104.0391056936.

The spelling of 1345715857 in words is "one billion, three hundred forty-five million, seven hundred fifteen thousand, eight hundred fifty-seven".