1985571 has 12 divisors (see below), whose sum is σ = 3277872. Its totient is φ = 1134576.

The previous prime is 1985561. The next prime is 1985573. The reversal of 1985571 is 1755891.

1985571 is a `hidden beast` number, since 1 + 9 + 85 + 571 = 666.

It is not a de Polignac number, because 1985571 - 2¹⁰ = 1984547 is a prime.

1985571 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1985573) 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, 15696 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (273156).

2^1985571 is an apocalyptic number.

1985571 is a deficient number, since it is larger than the sum of its proper divisors (1292301).

1985571 is a wasteful number, since it uses less digits than its factorization.

1985571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31530 (or 31527 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The square root of 1985571 is about 1409.1029061073. The cubic root of 1985571 is about 125.6883834006.

It can be divided in two parts, 1985 and 571, that added together give a triangular number (2556 = T₇₁).

The spelling of 1985571 in words is "one million, nine hundred eighty-five thousand, five hundred seventy-one".