401261555 has 4 divisors (see below), whose sum is σ = 481513872. Its totient is φ = 321009240.

The previous prime is 401261543. The next prime is 401261579. The reversal of 401261555 is 555162104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 401261555 - 2⁶ = 401261491 is a prime.

It is a super-2 number, since 2×401261555² = 322021671042036050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40126151 + ... + 40126160.

It is an arithmetic number, because the mean of its divisors is an integer number (120378468).

Almost surely, 2^401261555 is an apocalyptic number.

401261555 is a deficient number, since it is larger than the sum of its proper divisors (80252317).

401261555 is an equidigital number, since it uses as much as digits as its factorization.

401261555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80252316.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 401261555 is about 20031.5140466216. The cubic root of 401261555 is about 737.5800882096.

The spelling of 401261555 in words is "four hundred one million, two hundred sixty-one thousand, five hundred fifty-five".