4001312561 has 8 divisors (see below), whose sum is σ = 4076037504. Its totient is φ = 3927029040.

The previous prime is 4001312551. The next prime is 4001312659. The reversal of 4001312561 is 1652131004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4001312561 - 2¹⁰ = 4001311537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001312521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92030 + ... + 128343.

It is an arithmetic number, because the mean of its divisors is an integer number (509504688).

Almost surely, 2^4001312561 is an apocalyptic number.

It is an amenable number.

4001312561 is a deficient number, since it is larger than the sum of its proper divisors (74724943).

4001312561 is a wasteful number, since it uses less digits than its factorization.

4001312561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220711.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 4001312561 is about 63255.9290580733. The cubic root of 4001312561 is about 1587.5746630393.

Adding to 4001312561 its reverse (1652131004), we get a palindrome (5653443565).

The spelling of 4001312561 in words is "four billion, one million, three hundred twelve thousand, five hundred sixty-one".