238718631631 has 4 divisors (see below), whose sum is σ = 238738456000. Its totient is φ = 238698807264.

The previous prime is 238718631629. The next prime is 238718631653. The reversal of 238718631631 is 136136817832.

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

It is a cyclic number.

It is not a de Polignac number, because 238718631631 - 2¹ = 238718631629 is a prime.

It is a super-2 number, since 2×238718631631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238718637631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9894111 + ... + 9918208.

It is an arithmetic number, because the mean of its divisors is an integer number (59684614000).

Almost surely, 2^238718631631 is an apocalyptic number.

238718631631 is a deficient number, since it is larger than the sum of its proper divisors (19824369).

238718631631 is a wasteful number, since it uses less digits than its factorization.

238718631631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19824368.

The product of its digits is 870912, while the sum is 49.

The spelling of 238718631631 in words is "two hundred thirty-eight billion, seven hundred eighteen million, six hundred thirty-one thousand, six hundred thirty-one".