238810861 has 2 divisors, whose sum is σ = 238810862. Its totient is φ = 238810860.

The previous prime is 238810801. The next prime is 238810877. The reversal of 238810861 is 168018832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161036100 + 77774761 = 12690^2 + 8819^2 .

It is a cyclic number.

It is not a de Polignac number, because 238810861 - 2¹⁷ = 238679789 is a prime.

It is a super-2 number, since 2×238810861² = 114061254663122642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 238810861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238810801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119405430 + 119405431.

It is an arithmetic number, because the mean of its divisors is an integer number (119405431).

Almost surely, 2^238810861 is an apocalyptic number.

It is an amenable number.

238810861 is a deficient number, since it is larger than the sum of its proper divisors (1).

238810861 is an equidigital number, since it uses as much as digits as its factorization.

238810861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 238810861 is about 15453.5064305807. The cubic root of 238810861 is about 620.4184315545.

The spelling of 238810861 in words is "two hundred thirty-eight million, eight hundred ten thousand, eight hundred sixty-one".