238100561 has 2 divisors, whose sum is σ = 238100562. Its totient is φ = 238100560.

The previous prime is 238100557. The next prime is 238100563. The reversal of 238100561 is 165001832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191656336 + 46444225 = 13844^2 + 6815^2 .

It is a cyclic number.

It is not a de Polignac number, because 238100561 - 2² = 238100557 is a prime.

Together with 238100563, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 238100561.

It is not a weakly prime, because it can be changed into another prime (238100563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119050280 + 119050281.

It is an arithmetic number, because the mean of its divisors is an integer number (119050281).

Almost surely, 2^238100561 is an apocalyptic number.

It is an amenable number.

238100561 is a deficient number, since it is larger than the sum of its proper divisors (1).

238100561 is an equidigital number, since it uses as much as digits as its factorization.

238100561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 238100561 is about 15430.5074770728. The cubic root of 238100561 is about 619.8027129834.

The spelling of 238100561 in words is "two hundred thirty-eight million, one hundred thousand, five hundred sixty-one".