2975172561 has 6 divisors (see below), whose sum is σ = 4297471490. Its totient is φ = 1983448368.

The previous prime is 2975172547. The next prime is 2975172637. The reversal of 2975172561 is 1652715792.

2975172561 is a `hidden beast` number, since 2 + 9 + 75 + 17 + 2 + 561 = 666.

2975172561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2955988161 + 19184400 = 54369^2 + 4380^2 .

It is not a de Polignac number, because 2975172561 - 2¹⁸ = 2974910417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2975172461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 165287356 + ... + 165287373.

Almost surely, 2^2975172561 is an apocalyptic number.

It is an amenable number.

2975172561 is a deficient number, since it is larger than the sum of its proper divisors (1322298929).

2975172561 is a wasteful number, since it uses less digits than its factorization.

2975172561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330574735 (or 330574732 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 2975172561 is about 54545.1424143342. The cubic root of 2975172561 is about 1438.2599482798.

The spelling of 2975172561 in words is "two billion, nine hundred seventy-five million, one hundred seventy-two thousand, five hundred sixty-one".