9215954849 has 2 divisors, whose sum is σ = 9215954850. Its totient is φ = 9215954848.

The previous prime is 9215954819. The next prime is 9215954887. The reversal of 9215954849 is 9484595129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7372798225 + 1843156624 = 85865^2 + 42932^2 .

It is an emirp because it is prime and its reverse (9484595129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9215954849 - 2⁸ = 9215954593 is a prime.

It is a super-2 number, since 2×9215954849² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9215954794 and 9215954803.

It is not a weakly prime, because it can be changed into another prime (9215954819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4607977424 + 4607977425.

It is an arithmetic number, because the mean of its divisors is an integer number (4607977425).

Almost surely, 2^9215954849 is an apocalyptic number.

It is an amenable number.

9215954849 is a deficient number, since it is larger than the sum of its proper divisors (1).

9215954849 is an equidigital number, since it uses as much as digits as its factorization.

9215954849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 56.

The square root of 9215954849 is about 95999.7648382536. The cubic root of 9215954849 is about 2096.5896914873.

The spelling of 9215954849 in words is "nine billion, two hundred fifteen million, nine hundred fifty-four thousand, eight hundred forty-nine".