61442121 has 16 divisors (see below), whose sum is σ = 88494336. Its totient is φ = 37694976.

The previous prime is 61442111. The next prime is 61442123. The reversal of 61442121 is 12124416.

It is a happy number.

It is not a de Polignac number, because 61442121 - 2¹⁰ = 61441097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61442123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11536 + ... + 15998.

It is an arithmetic number, because the mean of its divisors is an integer number (5530896).

Almost surely, 2^61442121 is an apocalyptic number.

It is an amenable number.

61442121 is a deficient number, since it is larger than the sum of its proper divisors (27052215).

61442121 is a wasteful number, since it uses less digits than its factorization.

61442121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832.

The product of its digits is 384, while the sum is 21.

The square root of 61442121 is about 7838.5024717735. The cubic root of 61442121 is about 394.5984724967.

Adding to 61442121 its reverse (12124416), we get a palindrome (73566537).

The spelling of 61442121 in words is "sixty-one million, four hundred forty-two thousand, one hundred twenty-one".