2031530542561 has 8 divisors (see below), whose sum is σ = 2187829806120. Its totient is φ = 1875235233792.

The previous prime is 2031530542553. The next prime is 2031530542567. The reversal of 2031530542561 is 1652450351302.

It can be written as a sum of positive squares in 4 ways, for example, as 265704166225 + 1765826376336 = 515465^2 + 1328844^2 .

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 2031530542561 - 2³ = 2031530542553 is a prime.

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 2031530542561.

It is not an unprimeable number, because it can be changed into a prime (2031530542567) 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, 124641 + ... + 2019553.

It is an arithmetic number, because the mean of its divisors is an integer number (273478725765).

Almost surely, 2^{2031530542561} is an apocalyptic number.

It is an amenable number.

2031530542561 is a deficient number, since it is larger than the sum of its proper divisors (156299263559).

2031530542561 is a wasteful number, since it uses less digits than its factorization.

2031530542561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977395.

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 2031530542561 its reverse (1652450351302), we get a palindrome (3683980893863).

The spelling of 2031530542561 in words is "two trillion, thirty-one billion, five hundred thirty million, five hundred forty-two thousand, five hundred sixty-one".