1081651 has 4 divisors (see below), whose sum is σ = 1138600. Its totient is φ = 1024704.

The previous prime is 1081637. The next prime is 1081657. The reversal of 1081651 is 1561801.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1081651 - 2⁹ = 1081139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28446 + ... + 28483.

It is an arithmetic number, because the mean of its divisors is an integer number (284650).

2^1081651 is an apocalyptic number.

1081651 is a deficient number, since it is larger than the sum of its proper divisors (56949).

1081651 is an equidigital number, since it uses as much as digits as its factorization.

1081651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56948.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1081651 is about 1040.0245189417. The cubic root of 1081651 is about 102.6508111138.

The spelling of 1081651 in words is "one million, eighty-one thousand, six hundred fifty-one".