217142741 has 2 divisors, whose sum is σ = 217142742. Its totient is φ = 217142740.

The previous prime is 217142711. The next prime is 217142767. The reversal of 217142741 is 147241712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216384100 + 758641 = 14710^2 + 871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217142741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217142711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108571370 + 108571371.

It is an arithmetic number, because the mean of its divisors is an integer number (108571371).

Almost surely, 2^217142741 is an apocalyptic number.

It is an amenable number.

217142741 is a deficient number, since it is larger than the sum of its proper divisors (1).

217142741 is an equidigital number, since it uses as much as digits as its factorization.

217142741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 29.

The square root of 217142741 is about 14735.7640114111. The cubic root of 217142741 is about 601.0562330470.

The spelling of 217142741 in words is "two hundred seventeen million, one hundred forty-two thousand, seven hundred forty-one".