217867061 has 2 divisors, whose sum is σ = 217867062. Its totient is φ = 217867060.

The previous prime is 217867037. The next prime is 217867081. The reversal of 217867061 is 160768712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175695025 + 42172036 = 13255^2 + 6494^2 .

It is a cyclic number.

It is not a de Polignac number, because 217867061 - 2⁶ = 217866997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217867021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108933530 + 108933531.

It is an arithmetic number, because the mean of its divisors is an integer number (108933531).

Almost surely, 2^217867061 is an apocalyptic number.

It is an amenable number.

217867061 is a deficient number, since it is larger than the sum of its proper divisors (1).

217867061 is an equidigital number, since it uses as much as digits as its factorization.

217867061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 217867061 is about 14760.3204911005. The cubic root of 217867061 is about 601.7238029480.

The spelling of 217867061 in words is "two hundred seventeen million, eight hundred sixty-seven thousand, sixty-one".