1971549 has 12 divisors (see below), whose sum is σ = 2860000. Its totient is φ = 1308744.

The previous prime is 1971539. The next prime is 1971553. The reversal of 1971549 is 9451791.

It is not a de Polignac number, because 1971549 - 2⁵ = 1971517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3702 + ... + 4200.

2^1971549 is an apocalyptic number.

It is an amenable number.

1971549 is a deficient number, since it is larger than the sum of its proper divisors (888451).

1971549 is a wasteful number, since it uses less digits than its factorization.

1971549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 941 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 1971549 is about 1404.1185847356. The cubic root of 1971549 is about 125.3918158926.

The spelling of 1971549 in words is "one million, nine hundred seventy-one thousand, five hundred forty-nine".