61242121 has 4 divisors (see below), whose sum is σ = 61286292. Its totient is φ = 61197952.

The previous prime is 61242119. The next prime is 61242133. The reversal of 61242121 is 12124216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47817225 + 13424896 = 6915^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 61242121 - 2¹ = 61242119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61242101) 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, 19936 + ... + 22801.

It is an arithmetic number, because the mean of its divisors is an integer number (15321573).

Almost surely, 2^61242121 is an apocalyptic number.

It is an amenable number.

61242121 is a deficient number, since it is larger than the sum of its proper divisors (44171).

61242121 is a wasteful number, since it uses less digits than its factorization.

61242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44170.

The product of its digits is 192, while the sum is 19.

The square root of 61242121 is about 7825.7345342147. The cubic root of 61242121 is about 394.1698551313.

Adding to 61242121 its reverse (12124216), we get a palindrome (73366337).

The spelling of 61242121 in words is "sixty-one million, two hundred forty-two thousand, one hundred twenty-one".