1217728471 has 2 divisors, whose sum is σ = 1217728472. Its totient is φ = 1217728470.

The previous prime is 1217728459. The next prime is 1217728483. The reversal of 1217728471 is 1748277121.

It is a balanced prime because it is at equal distance from previous prime (1217728459) and next prime (1217728483).

It is a cyclic number.

It is not a de Polignac number, because 1217728471 - 2¹⁷ = 1217597399 is a prime.

It is a super-3 number, since 3×1217728471³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217758471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608864235 + 608864236.

It is an arithmetic number, because the mean of its divisors is an integer number (608864236).

Almost surely, 2^1217728471 is an apocalyptic number.

1217728471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217728471 is an equidigital number, since it uses as much as digits as its factorization.

1217728471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43904, while the sum is 40.

The square root of 1217728471 is about 34895.9664001443. The cubic root of 1217728471 is about 1067.8661497566.

The spelling of 1217728471 in words is "one billion, two hundred seventeen million, seven hundred twenty-eight thousand, four hundred seventy-one".