1217375641 has 2 divisors, whose sum is σ = 1217375642. Its totient is φ = 1217375640.

The previous prime is 1217375639. The next prime is 1217375647. The reversal of 1217375641 is 1465737121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 987216400 + 230159241 = 31420^2 + 15171^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217375641 - 2¹ = 1217375639 is a prime.

Together with 1217375639, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1217375641.

It is not a weakly prime, because it can be changed into another prime (1217375647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608687820 + 608687821.

It is an arithmetic number, because the mean of its divisors is an integer number (608687821).

Almost surely, 2^1217375641 is an apocalyptic number.

It is an amenable number.

1217375641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217375641 is an equidigital number, since it uses as much as digits as its factorization.

1217375641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 1217375641 is about 34890.9105785447. The cubic root of 1217375641 is about 1067.7630037165.

The spelling of 1217375641 in words is "one billion, two hundred seventeen million, three hundred seventy-five thousand, six hundred forty-one".