1661471 has 8 divisors (see below), whose sum is σ = 1926144. Its totient is φ = 1403640.

The previous prime is 1661447. The next prime is 1661479. The reversal of 1661471 is 1741661.

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

It is not a de Polignac number, because 1661471 - 2¹⁴ = 1645087 is a prime.

It is a super-3 number, since 3×1661471³ = 13759401725733570333, which contains 333 as substring.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 1661471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1175 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (240768).

2^1661471 is an apocalyptic number.

1661471 is a deficient number, since it is larger than the sum of its proper divisors (264673).

1661471 is an equidigital number, since it uses as much as digits as its factorization.

1661471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421.

The product of its digits is 1008, while the sum is 26.

The square root of 1661471 is about 1288.9806049743. The cubic root of 1661471 is about 118.4397790234.

The spelling of 1661471 in words is "one million, six hundred sixty-one thousand, four hundred seventy-one".