2561430061 has 2 divisors, whose sum is σ = 2561430062. Its totient is φ = 2561430060.

The previous prime is 2561430041. The next prime is 2561430127. The reversal of 2561430061 is 1600341652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2480538025 + 80892036 = 49805^2 + 8994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561430061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561430041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280715030 + 1280715031.

It is an arithmetic number, because the mean of its divisors is an integer number (1280715031).

Almost surely, 2^2561430061 is an apocalyptic number.

It is an amenable number.

2561430061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561430061 is an equidigital number, since it uses as much as digits as its factorization.

2561430061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2561430061 is about 50610.5726207479. The cubic root of 2561430061 is about 1368.2354359571.

The spelling of 2561430061 in words is "two billion, five hundred sixty-one million, four hundred thirty thousand, sixty-one".