1217270491 has 2 divisors, whose sum is σ = 1217270492. Its totient is φ = 1217270490.

The previous prime is 1217270449. The next prime is 1217270503. The reversal of 1217270491 is 1940727121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1940727121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1217270491 - 2¹¹ = 1217268443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217270441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608635245 + 608635246.

It is an arithmetic number, because the mean of its divisors is an integer number (608635246).

Almost surely, 2^1217270491 is an apocalyptic number.

1217270491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217270491 is an equidigital number, since it uses as much as digits as its factorization.

1217270491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1217270491 is about 34889.4037065697. The cubic root of 1217270491 is about 1067.7322603949.

The spelling of 1217270491 in words is "one billion, two hundred seventeen million, two hundred seventy thousand, four hundred ninety-one".