217115461 has 2 divisors, whose sum is σ = 217115462. Its totient is φ = 217115460.

The previous prime is 217115453. The next prime is 217115491. The reversal of 217115461 is 164511712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132365025 + 84750436 = 11505^2 + 9206^2 .

It is a cyclic number.

It is not a de Polignac number, because 217115461 - 2³ = 217115453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217115441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108557730 + 108557731.

It is an arithmetic number, because the mean of its divisors is an integer number (108557731).

Almost surely, 2^217115461 is an apocalyptic number.

It is an amenable number.

217115461 is a deficient number, since it is larger than the sum of its proper divisors (1).

217115461 is an equidigital number, since it uses as much as digits as its factorization.

217115461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 217115461 is about 14734.8383431920. The cubic root of 217115461 is about 601.0310614316.

It can be divided in two parts, 21711 and 5461, that added together give a palindrome (27172).

The spelling of 217115461 in words is "two hundred seventeen million, one hundred fifteen thousand, four hundred sixty-one".