1616209897 has 2 divisors, whose sum is σ = 1616209898. Its totient is φ = 1616209896.

The previous prime is 1616209877. The next prime is 1616209919. The reversal of 1616209897 is 7989026161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1481557081 + 134652816 = 38491^2 + 11604^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616209897 - 2²³ = 1607821289 is a prime.

It is a super-2 number, since 2×1616209897² = 5224268862321501218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616209897.

It is not a weakly prime, because it can be changed into another prime (1616209807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808104948 + 808104949.

It is an arithmetic number, because the mean of its divisors is an integer number (808104949).

Almost surely, 2^1616209897 is an apocalyptic number.

It is an amenable number.

1616209897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616209897 is an equidigital number, since it uses as much as digits as its factorization.

1616209897 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 49.

The square root of 1616209897 is about 40202.1130912294. The cubic root of 1616209897 is about 1173.5436665498.

The spelling of 1616209897 in words is "one billion, six hundred sixteen million, two hundred nine thousand, eight hundred ninety-seven".