224157709 has 2 divisors, whose sum is σ = 224157710. Its totient is φ = 224157708.

The previous prime is 224157677. The next prime is 224157719. The reversal of 224157709 is 907751422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117614025 + 106543684 = 10845^2 + 10322^2 .

It is a cyclic number.

It is not a de Polignac number, because 224157709 - 2⁵ = 224157677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224157719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112078854 + 112078855.

It is an arithmetic number, because the mean of its divisors is an integer number (112078855).

Almost surely, 2^224157709 is an apocalyptic number.

It is an amenable number.

224157709 is a deficient number, since it is larger than the sum of its proper divisors (1).

224157709 is an equidigital number, since it uses as much as digits as its factorization.

224157709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 224157709 is about 14971.8973079567. The cubic root of 224157709 is about 607.4602899298.

The spelling of 224157709 in words is "two hundred twenty-four million, one hundred fifty-seven thousand, seven hundred nine".