217372153 has 2 divisors, whose sum is σ = 217372154. Its totient is φ = 217372152.

The previous prime is 217372147. The next prime is 217372157. The reversal of 217372153 is 351273712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149523984 + 67848169 = 12228^2 + 8237^2 .

It is a cyclic number.

It is not a de Polignac number, because 217372153 - 2⁹ = 217371641 is a prime.

It is not a weakly prime, because it can be changed into another prime (217372157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108686076 + 108686077.

It is an arithmetic number, because the mean of its divisors is an integer number (108686077).

Almost surely, 2^217372153 is an apocalyptic number.

It is an amenable number.

217372153 is a deficient number, since it is larger than the sum of its proper divisors (1).

217372153 is an equidigital number, since it uses as much as digits as its factorization.

217372153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 31.

The square root of 217372153 is about 14743.5461473826. The cubic root of 217372153 is about 601.2678311570.

The spelling of 217372153 in words is "two hundred seventeen million, three hundred seventy-two thousand, one hundred fifty-three".