1087621 has 2 divisors, whose sum is σ = 1087622. Its totient is φ = 1087620.

The previous prime is 1087591. The next prime is 1087631. The reversal of 1087621 is 1267801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 8100 = 1039^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087621 - 2⁵ = 1087589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087631) 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 as a sum of consecutive naturals, namely, 543810 + 543811.

It is an arithmetic number, because the mean of its divisors is an integer number (543811).

2^1087621 is an apocalyptic number.

It is an amenable number.

1087621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087621 is an equidigital number, since it uses as much as digits as its factorization.

1087621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1087621 is about 1042.8906941765. The cubic root of 1087621 is about 102.8393196447.

The spelling of 1087621 in words is "one million, eighty-seven thousand, six hundred twenty-one".