401315561 has 4 divisors (see below), whose sum is σ = 401385300. Its totient is φ = 401245824.

The previous prime is 401315533. The next prime is 401315573. The reversal of 401315561 is 165513104.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152275600 + 249039961 = 12340^2 + 15781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401315561 is a prime.

It is a super-2 number, since 2×401315561² = 322108359001489442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401315561.

It is not an unprimeable number, because it can be changed into a prime (401375561) by changing a digit.

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, 25376 + ... + 38033.

It is an arithmetic number, because the mean of its divisors is an integer number (100346325).

Almost surely, 2^401315561 is an apocalyptic number.

It is an amenable number.

401315561 is a deficient number, since it is larger than the sum of its proper divisors (69739).

401315561 is an equidigital number, since it uses as much as digits as its factorization.

401315561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69738.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 401315561 is about 20032.8620271792. The cubic root of 401315561 is about 737.6131771535.

Adding to 401315561 its reverse (165513104), we get a palindrome (566828665).

The spelling of 401315561 in words is "four hundred one million, three hundred fifteen thousand, five hundred sixty-one".