2511561 has 8 divisors (see below), whose sum is σ = 3606400. Its totient is φ = 1545552.

The previous prime is 2511557. The next prime is 2511569. The reversal of 2511561 is 1651152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2511561 - 2² = 2511557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2511569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32161 + ... + 32238.

It is an arithmetic number, because the mean of its divisors is an integer number (450800).

2^2511561 is an apocalyptic number.

It is an amenable number.

2511561 is a deficient number, since it is larger than the sum of its proper divisors (1094839).

2511561 is a wasteful number, since it uses less digits than its factorization.

2511561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64415.

The product of its digits is 300, while the sum is 21.

The square root of 2511561 is about 1584.7905224351. The cubic root of 2511561 is about 135.9297683805.

The spelling of 2511561 in words is "two million, five hundred eleven thousand, five hundred sixty-one".