1971545 has 8 divisors (see below), whose sum is σ = 2430024. Its totient is φ = 1534464.

The previous prime is 1971539. The next prime is 1971553. The reversal of 1971545 is 5451791.

It can be written as a sum of positive squares in 4 ways, for example, as 143641 + 1827904 = 379^2 + 1352^2 .

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

It is not a de Polignac number, because 1971545 - 2⁶ = 1971481 is a prime.

It is a Duffinian number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 5144 + ... + 5513.

It is an arithmetic number, because the mean of its divisors is an integer number (303753).

2^1971545 is an apocalyptic number.

It is an amenable number.

1971545 is a deficient number, since it is larger than the sum of its proper divisors (458479).

1971545 is a wasteful number, since it uses less digits than its factorization.

1971545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10699.

The product of its digits is 6300, while the sum is 32.

The square root of 1971545 is about 1404.1171603538. The cubic root of 1971545 is about 125.3917310916.

The spelling of 1971545 in words is "one million, nine hundred seventy-one thousand, five hundred forty-five".