9186712121 has 2 divisors, whose sum is σ = 9186712122. Its totient is φ = 9186712120.

The previous prime is 9186712069. The next prime is 9186712147. The reversal of 9186712121 is 1212176819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9162318400 + 24393721 = 95720^2 + 4939^2 .

It is a cyclic number.

It is not a de Polignac number, because 9186712121 - 2¹⁴ = 9186695737 is a prime.

It is not a weakly prime, because it can be changed into another prime (9186712151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4593356060 + 4593356061.

It is an arithmetic number, because the mean of its divisors is an integer number (4593356061).

Almost surely, 2^9186712121 is an apocalyptic number.

It is an amenable number.

9186712121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9186712121 is an equidigital number, since it uses as much as digits as its factorization.

9186712121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 38.

The square root of 9186712121 is about 95847.3375790898. The cubic root of 9186712121 is about 2094.3698107009.

The spelling of 9186712121 in words is "nine billion, one hundred eighty-six million, seven hundred twelve thousand, one hundred twenty-one".