1340217161 has 2 divisors, whose sum is σ = 1340217162. Its totient is φ = 1340217160.

The previous prime is 1340217139. The next prime is 1340217181. The reversal of 1340217161 is 1617120431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1290246400 + 49970761 = 35920^2 + 7069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340217161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1340217161.

It is not a weakly prime, because it can be changed into another prime (1340217101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670108580 + 670108581.

It is an arithmetic number, because the mean of its divisors is an integer number (670108581).

Almost surely, 2^1340217161 is an apocalyptic number.

It is an amenable number.

1340217161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340217161 is an equidigital number, since it uses as much as digits as its factorization.

1340217161 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 26.

The square root of 1340217161 is about 36608.9765085013. The cubic root of 1340217161 is about 1102.5333240305.

Adding to 1340217161 its reverse (1617120431), we get a palindrome (2957337592).

The spelling of 1340217161 in words is "one billion, three hundred forty million, two hundred seventeen thousand, one hundred sixty-one".