238069781 has 2 divisors, whose sum is σ = 238069782. Its totient is φ = 238069780.

The previous prime is 238069721. The next prime is 238069807. The reversal of 238069781 is 187960832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226954225 + 11115556 = 15065^2 + 3334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238069781 is a prime.

It is a super-2 number, since 2×238069781² = 113354441250775922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238069721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119034890 + 119034891.

It is an arithmetic number, because the mean of its divisors is an integer number (119034891).

Almost surely, 2^238069781 is an apocalyptic number.

It is an amenable number.

238069781 is a deficient number, since it is larger than the sum of its proper divisors (1).

238069781 is an equidigital number, since it uses as much as digits as its factorization.

238069781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 238069781 is about 15429.5100699925. The cubic root of 238069781 is about 619.7760038910.

The spelling of 238069781 in words is "two hundred thirty-eight million, sixty-nine thousand, seven hundred eighty-one".