1081631 has 2 divisors, whose sum is σ = 1081632. Its totient is φ = 1081630.

The previous prime is 1081583. The next prime is 1081637. The reversal of 1081631 is 1361801.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1081631 - 2¹⁸ = 819487 is a prime.

It is a super-2 number, since 2×1081631² = 2339851240322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540815 + 540816.

It is an arithmetic number, because the mean of its divisors is an integer number (540816).

2^1081631 is an apocalyptic number.

1081631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081631 is an equidigital number, since it uses as much as digits as its factorization.

1081631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1081631 is about 1040.0149037394. The cubic root of 1081631 is about 102.6501784301.

The spelling of 1081631 in words is "one million, eighty-one thousand, six hundred thirty-one".