909020381 has 2 divisors, whose sum is σ = 909020382. Its totient is φ = 909020380.

The previous prime is 909020377. The next prime is 909020383. The reversal of 909020381 is 183020909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 788767225 + 120253156 = 28085^2 + 10966^2 .

It is a cyclic number.

It is not a de Polignac number, because 909020381 - 2² = 909020377 is a prime.

It is a super-2 number, since 2×909020381² = 1652636106146770322, which contains 22 as substring.

Together with 909020383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (909020383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454510190 + 454510191.

It is an arithmetic number, because the mean of its divisors is an integer number (454510191).

Almost surely, 2^909020381 is an apocalyptic number.

It is an amenable number.

909020381 is a deficient number, since it is larger than the sum of its proper divisors (1).

909020381 is an equidigital number, since it uses as much as digits as its factorization.

909020381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 909020381 is about 30149.9648590177. The cubic root of 909020381 is about 968.7042538731.

The spelling of 909020381 in words is "nine hundred nine million, twenty thousand, three hundred eighty-one".