2661545 has 8 divisors (see below), whose sum is σ = 3230280. Its totient is φ = 2104960.

The previous prime is 2661541. The next prime is 2661553. The reversal of 2661545 is 5451662.

It can be written as a sum of positive squares in 4 ways, for example, as 63001 + 2598544 = 251^2 + 1612^2 .

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

It is not a de Polignac number, because 2661545 - 2² = 2661541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661541) 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, 2546 + ... + 3435.

It is an arithmetic number, because the mean of its divisors is an integer number (403785).

2^2661545 is an apocalyptic number.

It is an amenable number.

2661545 is a deficient number, since it is larger than the sum of its proper divisors (568735).

2661545 is an equidigital number, since it uses as much as digits as its factorization.

2661545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6075.

The product of its digits is 7200, while the sum is 29.

The square root of 2661545 is about 1631.4242244125. The cubic root of 2661545 is about 138.5834188391.

The spelling of 2661545 in words is "two million, six hundred sixty-one thousand, five hundred forty-five".