2145553 has 8 divisors (see below), whose sum is σ = 2310120. Its totient is φ = 1985280.

The previous prime is 2145551. The next prime is 2145617. The reversal of 2145553 is 3555412.

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 2140369 = 72^2 + 1463^2 .

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 2145553 - 2¹ = 2145551 is a prime.

It is a Duffinian number.

2145553 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2145551) 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, 3 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (288765).

2^2145553 is an apocalyptic number.

It is an amenable number.

2145553 is a deficient number, since it is larger than the sum of its proper divisors (164567).

2145553 is a wasteful number, since it uses less digits than its factorization.

2145553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147.

The product of its digits is 3000, while the sum is 25.

The square root of 2145553 is about 1464.7706305084. The cubic root of 2145553 is about 128.9772409422.

The spelling of 2145553 in words is "two million, one hundred forty-five thousand, five hundred fifty-three".