238187870681 has 4 divisors (see below), whose sum is σ = 238189192500. Its totient is φ = 238186548864.

The previous prime is 238187870663. The next prime is 238187870729. The reversal of 238187870681 is 186078781832.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 209722782025 + 28465088656 = 457955^2 + 168716^2 .

It is a cyclic number.

It is not a de Polignac number, because 238187870681 - 2¹⁰ = 238187869657 is a prime.

It is a super-2 number, since 2×238187870681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 238187870681.

It is not an unprimeable number, because it can be changed into a prime (238187876681) 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 3 ways as a sum of consecutive naturals, for example, 338036 + ... + 768533.

It is an arithmetic number, because the mean of its divisors is an integer number (59547298125).

Almost surely, 2^238187870681 is an apocalyptic number.

It is an amenable number.

238187870681 is a deficient number, since it is larger than the sum of its proper divisors (1321819).

238187870681 is a wasteful number, since it uses less digits than its factorization.

238187870681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321818.

The product of its (nonzero) digits is 7225344, while the sum is 59.

The spelling of 238187870681 in words is "two hundred thirty-eight billion, one hundred eighty-seven million, eight hundred seventy thousand, six hundred eighty-one".