401155501 has 2 divisors, whose sum is σ = 401155502. Its totient is φ = 401155500.

The previous prime is 401155487. The next prime is 401155523. The reversal of 401155501 is 105551104.

It is a happy number.

It is an a-pointer prime, because the next prime (401155523) can be obtained adding 401155501 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334341225 + 66814276 = 18285^2 + 8174^2 .

It is a cyclic number.

It is not a de Polignac number, because 401155501 - 2²⁷ = 266937773 is a prime.

It is a super-2 number, since 2×401155501² = 321851471965122002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401155541) 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, 200577750 + 200577751.

It is an arithmetic number, because the mean of its divisors is an integer number (200577751).

Almost surely, 2^401155501 is an apocalyptic number.

It is an amenable number.

401155501 is a deficient number, since it is larger than the sum of its proper divisors (1).

401155501 is an equidigital number, since it uses as much as digits as its factorization.

401155501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 401155501 is about 20028.8666928511. The cubic root of 401155501 is about 737.5151013282.

The spelling of 401155501 in words is "four hundred one million, one hundred fifty-five thousand, five hundred one".