1649172097 has 2 divisors, whose sum is σ = 1649172098. Its totient is φ = 1649172096.

The previous prime is 1649172079. The next prime is 1649172169. The reversal of 1649172097 is 7902719461.

Together with previous prime (1649172079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1408425841 + 240746256 = 37529^2 + 15516^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649172097 - 2¹¹ = 1649170049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1649172997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824586048 + 824586049.

It is an arithmetic number, because the mean of its divisors is an integer number (824586049).

Almost surely, 2^1649172097 is an apocalyptic number.

It is an amenable number.

1649172097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649172097 is an equidigital number, since it uses as much as digits as its factorization.

1649172097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 1649172097 is about 40609.9999630633. Note that the first 4 decimals coincide. The cubic root of 1649172097 is about 1181.4680801059.

It can be divided in two parts, 16491 and 72097, that added together give a palindrome (88588).

The spelling of 1649172097 in words is "one billion, six hundred forty-nine million, one hundred seventy-two thousand, ninety-seven".