2151752561 has 16 divisors (see below), whose sum is σ = 2476731264. Its totient is φ = 1831209984.

The previous prime is 2151752539. The next prime is 2151752609. The reversal of 2151752561 is 1652571512.

It is a cyclic number.

It is not a de Polignac number, because 2151752561 - 2⁶ = 2151752497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2151752531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 867455 + ... + 869931.

It is an arithmetic number, because the mean of its divisors is an integer number (154795704).

Almost surely, 2^2151752561 is an apocalyptic number.

It is an amenable number.

2151752561 is a deficient number, since it is larger than the sum of its proper divisors (324978703).

2151752561 is a wasteful number, since it uses less digits than its factorization.

2151752561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320.

The product of its digits is 21000, while the sum is 35.

The square root of 2151752561 is about 46386.9869791087. The cubic root of 2151752561 is about 1291.0134777434.

The spelling of 2151752561 in words is "two billion, one hundred fifty-one million, seven hundred fifty-two thousand, five hundred sixty-one".