2561533103 has 2 divisors, whose sum is σ = 2561533104. Its totient is φ = 2561533102.

The previous prime is 2561533031. The next prime is 2561533111. The reversal of 2561533103 is 3013351652.

Together with previous prime (2561533031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561533103 - 2²⁸ = 2293097647 is a prime.

It is a super-2 number, since 2×2561533103² = 13122903675529617218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561533133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280766551 + 1280766552.

It is an arithmetic number, because the mean of its divisors is an integer number (1280766552).

Almost surely, 2^2561533103 is an apocalyptic number.

2561533103 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561533103 is an equidigital number, since it uses as much as digits as its factorization.

2561533103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 2561533103 is about 50611.5905993874. The cubic root of 2561533103 is about 1368.2537829771.

Adding to 2561533103 its reverse (3013351652), we get a palindrome (5574884755).

The spelling of 2561533103 in words is "two billion, five hundred sixty-one million, five hundred thirty-three thousand, one hundred three".