1243581 has 8 divisors (see below), whose sum is σ = 1673760. Its totient is φ = 821232.

The previous prime is 1243579. The next prime is 1243609. The reversal of 1243581 is 1853421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243581 - 2¹ = 1243579 is a prime.

It is a super-2 number, since 2×1243581² = 3092987407122, which contains 22 as substring.

1243581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1575 + ... + 2228.

It is an arithmetic number, because the mean of its divisors is an integer number (209220).

2^1243581 is an apocalyptic number.

It is an amenable number.

1243581 is a deficient number, since it is larger than the sum of its proper divisors (430179).

1243581 is a wasteful number, since it uses less digits than its factorization.

1243581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915.

The product of its digits is 960, while the sum is 24.

The square root of 1243581 is about 1115.1596298288. The cubic root of 1243581 is about 107.5370270864.

The spelling of 1243581 in words is "one million, two hundred forty-three thousand, five hundred eighty-one".