1671281 has 4 divisors (see below), whose sum is σ = 1710192. Its totient is φ = 1632372.

The previous prime is 1671277. The next prime is 1671289. The reversal of 1671281 is 1821761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1671281 - 2² = 1671277 is a prime.

It is a super-2 number, since 2×1671281² = 5586360361922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1671281.

It is not an unprimeable number, because it can be changed into a prime (1671289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19391 + ... + 19476.

It is an arithmetic number, because the mean of its divisors is an integer number (427548).

2^1671281 is an apocalyptic number.

It is an amenable number.

1671281 is a deficient number, since it is larger than the sum of its proper divisors (38911).

1671281 is an equidigital number, since it uses as much as digits as its factorization.

1671281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38910.

The product of its digits is 672, while the sum is 26.

The square root of 1671281 is about 1292.7803371029. The cubic root of 1671281 is about 118.6724272688.

The spelling of 1671281 in words is "one million, six hundred seventy-one thousand, two hundred eighty-one".