1242591 has 24 divisors (see below), whose sum is σ = 1969920. Its totient is φ = 694512.

The previous prime is 1242569. The next prime is 1242601. The reversal of 1242591 is 1952421.

It is not a de Polignac number, because 1242591 - 2¹¹ = 1240543 is a prime.

1242591 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11560 + ... + 11666.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2^1242591 is an apocalyptic number.

1242591 is a deficient number, since it is larger than the sum of its proper divisors (727329).

1242591 is a wasteful number, since it uses less digits than its factorization.

1242591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 196 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 1242591 is about 1114.7156588117. The cubic root of 1242591 is about 107.5084831957.

The spelling of 1242591 in words is "one million, two hundred forty-two thousand, five hundred ninety-one".