406780181 has 2 divisors, whose sum is σ = 406780182. Its totient is φ = 406780180.

The previous prime is 406780169. The next prime is 406780193. The reversal of 406780181 is 181087604.

It is a balanced prime because it is at equal distance from previous prime (406780169) and next prime (406780193).

It can be written as a sum of positive squares in only one way, i.e., 306600100 + 100180081 = 17510^2 + 10009^2 .

It is a cyclic number.

It is not a de Polignac number, because 406780181 - 2¹⁰ = 406779157 is a prime.

It is a super-2 number, since 2×406780181² = 330940231308785522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406750181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203390090 + 203390091.

It is an arithmetic number, because the mean of its divisors is an integer number (203390091).

Almost surely, 2^406780181 is an apocalyptic number.

It is an amenable number.

406780181 is a deficient number, since it is larger than the sum of its proper divisors (1).

406780181 is an equidigital number, since it uses as much as digits as its factorization.

406780181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 406780181 is about 20168.7922543716. The cubic root of 406780181 is about 740.9460635335.

It can be divided in two parts, 4067 and 80181, that added together give a palindrome (84248).

The spelling of 406780181 in words is "four hundred six million, seven hundred eighty thousand, one hundred eighty-one".