238281691 has 2 divisors, whose sum is σ = 238281692. Its totient is φ = 238281690.

The previous prime is 238281671. The next prime is 238281721. The reversal of 238281691 is 196182832.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238281691 is a prime.

It is not a weakly prime, because it can be changed into another prime (238281611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119140845 + 119140846.

It is an arithmetic number, because the mean of its divisors is an integer number (119140846).

Almost surely, 2^238281691 is an apocalyptic number.

238281691 is a deficient number, since it is larger than the sum of its proper divisors (1).

238281691 is an equidigital number, since it uses as much as digits as its factorization.

238281691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 238281691 is about 15436.3755784834. The cubic root of 238281691 is about 619.9598404442.

The spelling of 238281691 in words is "two hundred thirty-eight million, two hundred eighty-one thousand, six hundred ninety-one".