1317143961 has 18 divisors (see below), whose sum is σ = 2213161002. Its totient is φ = 752653440.

The previous prime is 1317143939. The next prime is 1317143963. The reversal of 1317143961 is 1693417131.

It can be written as a sum of positive squares in only one way, i.e., 1274490000 + 42653961 = 35700^2 + 6531^2 .

It is not a de Polignac number, because 1317143961 - 2¹⁷ = 1317012889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1317143963) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1492920 + ... + 1493801.

It is an arithmetic number, because the mean of its divisors is an integer number (122953389).

Almost surely, 2^1317143961 is an apocalyptic number.

It is an amenable number.

1317143961 is a deficient number, since it is larger than the sum of its proper divisors (896017041).

1317143961 is a wasteful number, since it uses less digits than its factorization.

1317143961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986741 (or 2986731 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 1317143961 is about 36292.4780223120. The cubic root of 1317143961 is about 1096.1695866060.

The spelling of 1317143961 in words is "one billion, three hundred seventeen million, one hundred forty-three thousand, nine hundred sixty-one".