1242521 has 8 divisors (see below), whose sum is σ = 1431360. Its totient is φ = 1056528.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242521 is 1252421.

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

It is a cyclic number.

It is not a de Polignac number, because 1242521 - 2² = 1242517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242521.

It is not an unprimeable number, because it can be changed into a prime (1242121) 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, 335 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (178920).

2^1242521 is an apocalyptic number.

It is an amenable number.

1242521 is a deficient number, since it is larger than the sum of its proper divisors (188839).

1242521 is a wasteful number, since it uses less digits than its factorization.

1242521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423.

The product of its digits is 160, while the sum is 17.

The square root of 1242521 is about 1114.6842602280. The cubic root of 1242521 is about 107.5064643670.

Adding to 1242521 its reverse (1252421), we get a palindrome (2494942).

The spelling of 1242521 in words is "one million, two hundred forty-two thousand, five hundred twenty-one".