2561313661031 has 2 divisors, whose sum is σ = 2561313661032. Its totient is φ = 2561313661030.

The previous prime is 2561313661009. The next prime is 2561313661073. The reversal of 2561313661031 is 1301663131652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2561313661031 - 2¹⁰ = 2561313660007 is a prime.

It is a super-2 number, since 2×2561313661031² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561313661331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280656830515 + 1280656830516.

It is an arithmetic number, because the mean of its divisors is an integer number (1280656830516).

Almost surely, 2^{2561313661031} is an apocalyptic number.

2561313661031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561313661031 is an equidigital number, since it uses as much as digits as its factorization.

2561313661031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

Adding to 2561313661031 its reverse (1301663131652), we get a palindrome (3862976792683).

The spelling of 2561313661031 in words is "two trillion, five hundred sixty-one billion, three hundred thirteen million, six hundred sixty-one thousand, thirty-one".