381911471 has 2 divisors, whose sum is σ = 381911472. Its totient is φ = 381911470.

The previous prime is 381911393. The next prime is 381911483. The reversal of 381911471 is 174119183.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381911471 is a prime.

It is a super-3 number, since 3×381911471³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381910471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190955735 + 190955736.

It is an arithmetic number, because the mean of its divisors is an integer number (190955736).

Almost surely, 2^381911471 is an apocalyptic number.

381911471 is a deficient number, since it is larger than the sum of its proper divisors (1).

381911471 is an equidigital number, since it uses as much as digits as its factorization.

381911471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 381911471 is about 19542.5553856194. Note that the first 3 decimals coincide. The cubic root of 381911471 is about 725.5280946683.

The spelling of 381911471 in words is "three hundred eighty-one million, nine hundred eleven thousand, four hundred seventy-one".