238311131 has 4 divisors (see below), whose sum is σ = 238769064. Its totient is φ = 237853200.

The previous prime is 238311121. The next prime is 238311137. The reversal of 238311131 is 131113832.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238311131 is a prime.

It is a super-2 number, since 2×238311131² = 113584390316998322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 238311097 and 238311106.

It is not an unprimeable number, because it can be changed into a prime (238311137) 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, 228185 + ... + 229226.

It is an arithmetic number, because the mean of its divisors is an integer number (59692266).

Almost surely, 2^238311131 is an apocalyptic number.

238311131 is a deficient number, since it is larger than the sum of its proper divisors (457933).

238311131 is an equidigital number, since it uses as much as digits as its factorization.

238311131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457932.

The product of its digits is 432, while the sum is 23.

The square root of 238311131 is about 15437.3291407549. The cubic root of 238311131 is about 619.9853716632.

Adding to 238311131 its reverse (131113832), we get a palindrome (369424963).

The spelling of 238311131 in words is "two hundred thirty-eight million, three hundred eleven thousand, one hundred thirty-one".