2154545 has 4 divisors (see below), whose sum is σ = 2585460. Its totient is φ = 1723632.

The previous prime is 2154541. The next prime is 2154553. The reversal of 2154545 is 5454512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1364224 + 790321 = 1168^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154545 - 2² = 2154541 is a prime.

2154545 is a modest number, since divided by 4545 gives 215 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2154541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215450 + ... + 215459.

It is an arithmetic number, because the mean of its divisors is an integer number (646365).

2^2154545 is an apocalyptic number.

It is an amenable number.

2154545 is a deficient number, since it is larger than the sum of its proper divisors (430915).

2154545 is an equidigital number, since it uses as much as digits as its factorization.

2154545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430914.

The product of its digits is 4000, while the sum is 26.

The square root of 2154545 is about 1467.8368437943. The cubic root of 2154545 is about 129.1571707668.

The spelling of 2154545 in words is "two million, one hundred fifty-four thousand, five hundred forty-five".