2125561 has 8 divisors (see below), whose sum is σ = 2275560. Its totient is φ = 1978368.

The previous prime is 2125559. The next prime is 2125567. The reversal of 2125561 is 1655212.

It can be written as a sum of positive squares in 4 ways, for example, as 846400 + 1279161 = 920^2 + 1131^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2125561 - 2¹ = 2125559 is a prime.

It is a Duffinian number.

2125561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2125567) 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, 1005 + ... + 2293.

It is an arithmetic number, because the mean of its divisors is an integer number (284445).

2^2125561 is an apocalyptic number.

It is an amenable number.

2125561 is a deficient number, since it is larger than the sum of its proper divisors (149999).

2125561 is a wasteful number, since it uses less digits than its factorization.

2125561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403.

The product of its digits is 600, while the sum is 22.

The square root of 2125561 is about 1457.9303824257. The cubic root of 2125561 is about 128.5753921765.

It can be divided in two parts, 21255 and 61, that added together give a square (21316 = 146²).

The spelling of 2125561 in words is "two million, one hundred twenty-five thousand, five hundred sixty-one".