2157471 has 12 divisors (see below), whose sum is σ = 3175848. Its totient is φ = 1410864.

The previous prime is 2157457. The next prime is 2157481. The reversal of 2157471 is 1747512.

2157471 is a `hidden beast` number, since 21 + 574 + 71 = 666.

It is not a de Polignac number, because 2157471 - 2⁷ = 2157343 is a prime.

It is a super-3 number, since 3×2157471³ = 30127018565023794333, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1785 + ... + 2738.

It is an arithmetic number, because the mean of its divisors is an integer number (264654).

2^2157471 is an apocalyptic number.

2157471 is a deficient number, since it is larger than the sum of its proper divisors (1018377).

2157471 is a wasteful number, since it uses less digits than its factorization.

2157471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4582 (or 4579 counting only the distinct ones).

The product of its digits is 1960, while the sum is 27.

The square root of 2157471 is about 1468.8332104089. The cubic root of 2157471 is about 129.2156120207.

It can be divided in two parts, 2157 and 471, that added together give a triangular number (2628 = T₇₂).

The spelling of 2157471 in words is "two million, one hundred fifty-seven thousand, four hundred seventy-one".