121404181 has 2 divisors, whose sum is σ = 121404182. Its totient is φ = 121404180.

The previous prime is 121404131. The next prime is 121404209. The reversal of 121404181 is 181404121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107453956 + 13950225 = 10366^2 + 3735^2 .

It is a cyclic number.

It is not a de Polignac number, because 121404181 - 2¹⁷ = 121273109 is a prime.

It is a super-2 number, since 2×121404181² = 29477950328561522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121404131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60702090 + 60702091.

It is an arithmetic number, because the mean of its divisors is an integer number (60702091).

Almost surely, 2^121404181 is an apocalyptic number.

It is an amenable number.

121404181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121404181 is an equidigital number, since it uses as much as digits as its factorization.

121404181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 121404181 is about 11018.3565471444. The cubic root of 121404181 is about 495.1588525298.

The spelling of 121404181 in words is "one hundred twenty-one million, four hundred four thousand, one hundred eighty-one".