904181 has 2 divisors, whose sum is σ = 904182. Its totient is φ = 904180.

The previous prime is 904157. The next prime is 904193. The reversal of 904181 is 181409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 1681 = 950^2 + 41^2 .

It is an emirp because it is prime and its reverse (181409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 904181 - 2⁶ = 904117 is a prime.

It is a super-2 number, since 2×904181² = 1635086561522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 904181.

It is not a weakly prime, because it can be changed into another prime (904121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452090 + 452091.

It is an arithmetic number, because the mean of its divisors is an integer number (452091).

2⁹⁰⁴¹⁸¹ is an apocalyptic number.

It is an amenable number.

904181 is a deficient number, since it is larger than the sum of its proper divisors (1).

904181 is an equidigital number, since it uses as much as digits as its factorization.

904181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 904181 is about 950.8843252468. The cubic root of 904181 is about 96.6982153598.

The spelling of 904181 in words is "nine hundred four thousand, one hundred eighty-one".