1217391113 has 2 divisors, whose sum is σ = 1217391114. Its totient is φ = 1217391112.

The previous prime is 1217391083. The next prime is 1217391137. The reversal of 1217391113 is 3111937121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1199098384 + 18292729 = 34628^2 + 4277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1217391113 is a prime.

It is a super-2 number, since 2×1217391113² = 2964082244022757538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1217391163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608695556 + 608695557.

It is an arithmetic number, because the mean of its divisors is an integer number (608695557).

Almost surely, 2^1217391113 is an apocalyptic number.

It is an amenable number.

1217391113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217391113 is an equidigital number, since it uses as much as digits as its factorization.

1217391113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 29.

The square root of 1217391113 is about 34891.1322974764. The cubic root of 1217391113 is about 1067.7675272064.

The spelling of 1217391113 in words is "one billion, two hundred seventeen million, three hundred ninety-one thousand, one hundred thirteen".