2154245805 has 24 divisors (see below), whose sum is σ = 3795244440. Its totient is φ = 1130094720.

The previous prime is 2154245789. The next prime is 2154245833. The reversal of 2154245805 is 5085424512.

2154245805 is a `hidden beast` number, since 2 + 1 + 54 + 24 + 580 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 105144516 + 2049101289 = 10254^2 + 45267^2 .

It is not a de Polignac number, because 2154245805 - 2⁴ = 2154245789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2154245805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 389650 + ... + 395139.

It is an arithmetic number, because the mean of its divisors is an integer number (158135185).

Almost surely, 2^2154245805 is an apocalyptic number.

It is an amenable number.

2154245805 is a deficient number, since it is larger than the sum of its proper divisors (1640998635).

2154245805 is a wasteful number, since it uses less digits than its factorization.

2154245805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784861 (or 784858 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The square root of 2154245805 is about 46413.8535892033. The cubic root of 2154245805 is about 1291.5119193779.

The spelling of 2154245805 in words is "two billion, one hundred fifty-four million, two hundred forty-five thousand, eight hundred five".