1242571 has 16 divisors (see below), whose sum is σ = 1444608. Its totient is φ = 1058400.

The previous prime is 1242569. The next prime is 1242601. The reversal of 1242571 is 1752421.

It is a happy number.

It is a 5-Lehmer number, since φ(1242571) divides (1242571-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 1242571 - 2¹ = 1242569 is a prime.

It is a deceptive number, since it divides R_1242570.

It is not an unprimeable number, because it can be changed into a prime (1242271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17466 + ... + 17536.

It is an arithmetic number, because the mean of its divisors is an integer number (90288).

2^1242571 is an apocalyptic number.

1242571 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1242571 is a deficient number, since it is larger than the sum of its proper divisors (202037).

1242571 is a wasteful number, since it uses less digits than its factorization.

1242571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162.

The product of its digits is 560, while the sum is 22.

The square root of 1242571 is about 1114.7066878780. The cubic root of 1242571 is about 107.5079063952.

Adding to 1242571 its reverse (1752421), we get a palindrome (2994992).

The spelling of 1242571 in words is "one million, two hundred forty-two thousand, five hundred seventy-one".