1081621 has 16 divisors (see below), whose sum is σ = 1225728. Its totient is φ = 950400.

The previous prime is 1081583. The next prime is 1081631. The reversal of 1081621 is 1261801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26361 + ... + 26401.

It is an arithmetic number, because the mean of its divisors is an integer number (76608).

2^1081621 is an apocalyptic number.

It is an amenable number.

1081621 is a deficient number, since it is larger than the sum of its proper divisors (144107).

1081621 is a wasteful number, since it uses less digits than its factorization.

1081621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1081621 is about 1040.0100961048. The cubic root of 1081621 is about 102.6498620853.

The spelling of 1081621 in words is "one million, eighty-one thousand, six hundred twenty-one".