1317961 has 2 divisors, whose sum is σ = 1317962.
Its totient is φ = 1317960.
The previous prime is 1317947. The next prime is 1317971. The reversal of 1317961 is 1697131.
It can be divided in two parts, 1317 and 961, that added together give a triangular number (2278 = T67).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 732736 + 585225 = 856^2 + 765^2
It is a cyclic number.
It is not a de Polignac number, because 1317961 - 25 = 1317929 is a prime.
1317961 is a lucky number.
It is not a weakly prime, because it can be changed into another prime (1317941) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658980 + 658981.
It is an arithmetic number, because the mean of its divisors is an integer number (658981).
21317961 is an apocalyptic number.
It is an amenable number.
1317961 is a deficient number, since it is larger than the sum of its proper divisors (1).
1317961 is an equidigital number, since it uses as much as digits as its factorization.
1317961 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1134, while the sum is 28.
The square root of 1317961 is about 1148.0248255155.
The cubic root of 1317961 is about 109.6396195139.
The spelling of 1317961 in words is "one million, three hundred seventeen thousand, nine hundred sixty-one".