938566381 has 2 divisors, whose sum is σ = 938566382. Its totient is φ = 938566380.

The previous prime is 938566339. The next prime is 938566403. The reversal of 938566381 is 183665839.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 808492356 + 130074025 = 28434^2 + 11405^2 .

It is a cyclic number.

It is not a de Polignac number, because 938566381 - 2¹³ = 938558189 is a prime.

It is a super-2 number, since 2×938566381² = 1761813703086874322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (938566331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469283190 + 469283191.

It is an arithmetic number, because the mean of its divisors is an integer number (469283191).

Almost surely, 2^938566381 is an apocalyptic number.

It is an amenable number.

938566381 is a deficient number, since it is larger than the sum of its proper divisors (1).

938566381 is an equidigital number, since it uses as much as digits as its factorization.

938566381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 49.

The square root of 938566381 is about 30636.0307644447. The cubic root of 938566381 is about 979.0878577220.

The spelling of 938566381 in words is "nine hundred thirty-eight million, five hundred sixty-six thousand, three hundred eighty-one".