2561371173 has 32 divisors (see below), whose sum is σ = 3901317120. Its totient is φ = 1660057200.

The previous prime is 2561371117. The next prime is 2561371193. The reversal of 2561371173 is 3711731652.

2561371173 is a `hidden beast` number, since 25 + 613 + 7 + 1 + 17 + 3 = 666.

It is not a de Polignac number, because 2561371173 - 2²¹ = 2559274021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561371193) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184936 + ... + 198302.

It is an arithmetic number, because the mean of its divisors is an integer number (121916160).

Almost surely, 2^2561371173 is an apocalyptic number.

It is an amenable number.

2561371173 is a deficient number, since it is larger than the sum of its proper divisors (1339945947).

2561371173 is a wasteful number, since it uses less digits than its factorization.

2561371173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13574 (or 13568 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 2561371173 is about 50609.9908417301. The cubic root of 2561371173 is about 1368.2249505038.

The spelling of 2561371173 in words is "two billion, five hundred sixty-one million, three hundred seventy-one thousand, one hundred seventy-three".