1221542 has 8 divisors (see below), whose sum is σ = 2094096. Its totient is φ = 523512.

The previous prime is 1221541. The next prime is 1221551. The reversal of 1221542 is 2451221.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1221542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43613 + ... + 43640.

It is an arithmetic number, because the mean of its divisors is an integer number (261762).

2^1221542 is an apocalyptic number.

1221542 is a deficient number, since it is larger than the sum of its proper divisors (872554).

1221542 is an equidigital number, since it uses as much as digits as its factorization.

1221542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87262.

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

The square root of 1221542 is about 1105.2339118938. The cubic root of 1221542 is about 106.8979724451.

Adding to 1221542 its reverse (2451221), we get a palindrome (3672763).

The spelling of 1221542 in words is "one million, two hundred twenty-one thousand, five hundred forty-two".