76872121 has 2 divisors, whose sum is σ = 76872122. Its totient is φ = 76872120.

The previous prime is 76872097. The next prime is 76872151. The reversal of 76872121 is 12127867.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76125625 + 746496 = 8725^2 + 864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76872121 is a prime.

It is not a weakly prime, because it can be changed into another prime (76872151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38436060 + 38436061.

It is an arithmetic number, because the mean of its divisors is an integer number (38436061).

Almost surely, 2^76872121 is an apocalyptic number.

It is an amenable number.

76872121 is a deficient number, since it is larger than the sum of its proper divisors (1).

76872121 is an equidigital number, since it uses as much as digits as its factorization.

76872121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 34.

The square root of 76872121 is about 8767.6747772713. The cubic root of 76872121 is about 425.1964415983.

Adding to 76872121 its reverse (12127867), we get a palindrome (88999988).

The spelling of 76872121 in words is "seventy-six million, eight hundred seventy-two thousand, one hundred twenty-one".