8170390649 has 2 divisors, whose sum is σ = 8170390650. Its totient is φ = 8170390648.

The previous prime is 8170390619. The next prime is 8170390663. The reversal of 8170390649 is 9460930718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5309745424 + 2860645225 = 72868^2 + 53485^2 .

It is a cyclic number.

It is not a de Polignac number, because 8170390649 - 2¹⁶ = 8170325113 is a prime.

It is not a weakly prime, because it can be changed into another prime (8170390609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4085195324 + 4085195325.

It is an arithmetic number, because the mean of its divisors is an integer number (4085195325).

Almost surely, 2^8170390649 is an apocalyptic number.

It is an amenable number.

8170390649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8170390649 is an equidigital number, since it uses as much as digits as its factorization.

8170390649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 8170390649 is about 90390.2132368322. The cubic root of 8170390649 is about 2014.0995879782.

The spelling of 8170390649 in words is "eight billion, one hundred seventy million, three hundred ninety thousand, six hundred forty-nine".