1013581 has 2 divisors, whose sum is σ = 1013582. Its totient is φ = 1013580.

The previous prime is 1013569. The next prime is 1013603. The reversal of 1013581 is 1853101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570025 + 443556 = 755^2 + 666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1013581 is a prime.

It is a super-2 number, since 2×1013581² = 2054692887122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1013501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506790 + 506791.

It is an arithmetic number, because the mean of its divisors is an integer number (506791).

2^1013581 is an apocalyptic number.

It is an amenable number.

1013581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013581 is an equidigital number, since it uses as much as digits as its factorization.

1013581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1013581 is about 1006.7675997965. The cubic root of 1013581 is about 100.4506659510.

Adding to 1013581 its reverse (1853101), we get a palindrome (2866682).

The spelling of 1013581 in words is "one million, thirteen thousand, five hundred eighty-one".