8742121 has 2 divisors, whose sum is σ = 8742122. Its totient is φ = 8742120.

The previous prime is 8742103. The next prime is 8742133. The reversal of 8742121 is 1212478.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 4247721 = 2120^2 + 2061^2 .

It is a cyclic number.

It is not a de Polignac number, because 8742121 - 2⁹ = 8741609 is a prime.

8742121 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8742161) 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 as a sum of consecutive naturals, namely, 4371060 + 4371061.

It is an arithmetic number, because the mean of its divisors is an integer number (4371061).

Almost surely, 2^8742121 is an apocalyptic number.

It is an amenable number.

8742121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8742121 is an equidigital number, since it uses as much as digits as its factorization.

8742121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 25.

The square root of 8742121 is about 2956.7077975343. The cubic root of 8742121 is about 206.0023957367.

Adding to 8742121 its reverse (1212478), we get a palindrome (9954599).

The spelling of 8742121 in words is "eight million, seven hundred forty-two thousand, one hundred twenty-one".