1249581 has 16 divisors (see below), whose sum is σ = 1762560. Its totient is φ = 786240.

The previous prime is 1249559. The next prime is 1249603. The reversal of 1249581 is 1859421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1249559) and next prime (1249603).

It is not a de Polignac number, because 1249581 - 2¹³ = 1241389 is a prime.

It is a super-2 number, since 2×1249581² = 3122905351122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249511) 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, 4476 + ... + 4746.

It is an arithmetic number, because the mean of its divisors is an integer number (110160).

2^1249581 is an apocalyptic number.

It is an amenable number.

1249581 is a deficient number, since it is larger than the sum of its proper divisors (512979).

1249581 is a wasteful number, since it uses less digits than its factorization.

1249581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356.

The product of its digits is 2880, while the sum is 30.

The square root of 1249581 is about 1117.8465905481. The cubic root of 1249581 is about 107.7096970480.

It can be divided in two parts, 1249 and 581, that added together give a triangular number (1830 = T₆₀).

The spelling of 1249581 in words is "one million, two hundred forty-nine thousand, five hundred eighty-one".