401155109 has 2 divisors, whose sum is σ = 401155110. Its totient is φ = 401155108.

The previous prime is 401155087. The next prime is 401155217. The reversal of 401155109 is 901551104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399600100 + 1555009 = 19990^2 + 1247^2 .

It is a cyclic number.

It is not a de Polignac number, because 401155109 - 2¹² = 401151013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401155309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200577554 + 200577555.

It is an arithmetic number, because the mean of its divisors is an integer number (200577555).

Almost surely, 2^401155109 is an apocalyptic number.

It is an amenable number.

401155109 is a deficient number, since it is larger than the sum of its proper divisors (1).

401155109 is an equidigital number, since it uses as much as digits as its factorization.

401155109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 401155109 is about 20028.8569069730. The cubic root of 401155109 is about 737.5148611005.

The spelling of 401155109 in words is "four hundred one million, one hundred fifty-five thousand, one hundred nine".