1901545 has 4 divisors (see below), whose sum is σ = 2281860. Its totient is φ = 1521232.

The previous prime is 1901531. The next prime is 1901551. The reversal of 1901545 is 5451091.

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 885481 + 1016064 = 941^2 + 1008^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901545 - 2⁹ = 1901033 is a prime.

1901545 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190150 + ... + 190159.

It is an arithmetic number, because the mean of its divisors is an integer number (570465).

2^1901545 is an apocalyptic number.

It is an amenable number.

1901545 is a deficient number, since it is larger than the sum of its proper divisors (380315).

1901545 is an equidigital number, since it uses as much as digits as its factorization.

1901545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380314.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1901545 is about 1378.9651917289. The cubic root of 1901545 is about 123.8897954253.

The spelling of 1901545 in words is "one million, nine hundred one thousand, five hundred forty-five".