238787618281 has 27 divisors (see below), whose sum is σ = 251643991557. Its totient is φ = 226581405120.

The previous prime is 238787618249. The next prime is 238787618299. The reversal of 238787618281 is 182816787832.

It is a happy number.

The square root of 238787618281 is 488659.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 83957960025 + 154829658256 = 289755^2 + 393484^2 .

It is not a de Polignac number, because 238787618281 - 2⁵ = 238787618249 is a prime.

It is a super-2 number, since 2×238787618281² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (238787618221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 849777861 + ... + 849778141.

Almost surely, 2^238787618281 is an apocalyptic number.

238787618281 is the 488659-th square number.

238787618281 is the 244330-th centered octagonal number.

It is an amenable number.

238787618281 is a deficient number, since it is larger than the sum of its proper divisors (12856373276).

238787618281 is an frugal number, since it uses more digits than its factorization.

238787618281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 365 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 61.

The spelling of 238787618281 in words is "two hundred thirty-eight billion, seven hundred eighty-seven million, six hundred eighteen thousand, two hundred eighty-one".