8142168949 has 2 divisors, whose sum is σ = 8142168950. Its totient is φ = 8142168948.

The previous prime is 8142168913. The next prime is 8142169019. The reversal of 8142168949 is 9498612418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8007028324 + 135140625 = 89482^2 + 11625^2 .

It is a cyclic number.

It is not a de Polignac number, because 8142168949 - 2⁷ = 8142168821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8142168896 and 8142168905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8142168149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4071084474 + 4071084475.

It is an arithmetic number, because the mean of its divisors is an integer number (4071084475).

Almost surely, 2^8142168949 is an apocalyptic number.

It is an amenable number.

8142168949 is a deficient number, since it is larger than the sum of its proper divisors (1).

8142168949 is an equidigital number, since it uses as much as digits as its factorization.

8142168949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 52.

The square root of 8142168949 is about 90233.9678225445. The cubic root of 8142168949 is about 2011.7779166048. Note that the first 3 decimals are identical.

The spelling of 8142168949 in words is "eight billion, one hundred forty-two million, one hundred sixty-eight thousand, nine hundred forty-nine".