3121323525561 has 32 divisors (see below), whose sum is σ = 4354644412800. Its totient is φ = 1986098526720.

The previous prime is 3121323525539. The next prime is 3121323525599. The reversal of 3121323525561 is 1655253231213.

It is not a de Polignac number, because 3121323525561 - 2⁹ = 3121323525049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3121323525161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35550726 + ... + 35638416.

It is an arithmetic number, because the mean of its divisors is an integer number (136082637900).

Almost surely, 2^{3121323525561} is an apocalyptic number.

It is an amenable number.

3121323525561 is a deficient number, since it is larger than the sum of its proper divisors (1233320887239).

3121323525561 is a wasteful number, since it uses less digits than its factorization.

3121323525561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92409.

The product of its digits is 162000, while the sum is 39.

Adding to 3121323525561 its reverse (1655253231213), we get a palindrome (4776576756774).

The spelling of 3121323525561 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-three million, five hundred twenty-five thousand, five hundred sixty-one".