381420917 has 2 divisors, whose sum is σ = 381420918. Its totient is φ = 381420916.

The previous prime is 381420889. The next prime is 381420929. The reversal of 381420917 is 719024183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346480996 + 34939921 = 18614^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 381420917 - 2¹⁰ = 381419893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381420947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190710458 + 190710459.

It is an arithmetic number, because the mean of its divisors is an integer number (190710459).

Almost surely, 2^381420917 is an apocalyptic number.

It is an amenable number.

381420917 is a deficient number, since it is larger than the sum of its proper divisors (1).

381420917 is an equidigital number, since it uses as much as digits as its factorization.

381420917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 381420917 is about 19530.0004352278. Note that the first 3 decimals coincide. The cubic root of 381420917 is about 725.2173217707.

The spelling of 381420917 in words is "three hundred eighty-one million, four hundred twenty thousand, nine hundred seventeen".