1611509897 has 2 divisors, whose sum is σ = 1611509898. Its totient is φ = 1611509896.

The previous prime is 1611509873. The next prime is 1611510013. The reversal of 1611509897 is 7989051161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1393976896 + 217533001 = 37336^2 + 14749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611509897 - 2³⁰ = 537768073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611509807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805754948 + 805754949.

It is an arithmetic number, because the mean of its divisors is an integer number (805754949).

Almost surely, 2^1611509897 is an apocalyptic number.

It is an amenable number.

1611509897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611509897 is an equidigital number, since it uses as much as digits as its factorization.

1611509897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 47.

The square root of 1611509897 is about 40143.6158934394. The cubic root of 1611509897 is about 1172.4049921577.

The spelling of 1611509897 in words is "one billion, six hundred eleven million, five hundred nine thousand, eight hundred ninety-seven".