1681291 has 8 divisors (see below), whose sum is σ = 1788480. Its totient is φ = 1576008.

The previous prime is 1681289. The next prime is 1681307. The reversal of 1681291 is 1921861.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1681291 - 2¹ = 1681289 is a prime.

It is a Duffinian number.

1681291 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1681201) 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, 1620 + ... + 2446.

It is an arithmetic number, because the mean of its divisors is an integer number (223560).

2^1681291 is an apocalyptic number.

1681291 is a deficient number, since it is larger than the sum of its proper divisors (107189).

1681291 is a wasteful number, since it uses less digits than its factorization.

1681291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953.

The product of its digits is 864, while the sum is 28.

The square root of 1681291 is about 1296.6460581053. The cubic root of 1681291 is about 118.9088820651.

The spelling of 1681291 in words is "one million, six hundred eighty-one thousand, two hundred ninety-one".