1616908861 has 2 divisors, whose sum is σ = 1616908862. Its totient is φ = 1616908860.

The previous prime is 1616908837. The next prime is 1616908871. The reversal of 1616908861 is 1688096161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1035616761 + 581292100 = 32181^2 + 24110^2 .

It is an emirp because it is prime and its reverse (1688096161) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1988069191 and 1919608891.

It is a cyclic number.

It is not a de Polignac number, because 1616908861 - 2¹¹ = 1616906813 is a prime.

It is a super-2 number, since 2×1616908861² = 5228788529560634642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616908871) 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, 808454430 + 808454431.

It is an arithmetic number, because the mean of its divisors is an integer number (808454431).

Almost surely, 2^1616908861 is an apocalyptic number.

It is an amenable number.

1616908861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616908861 is an equidigital number, since it uses as much as digits as its factorization.

1616908861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 1616908861 is about 40210.8052766915. The cubic root of 1616908861 is about 1173.7128167240.

The spelling of 1616908861 in words is "one billion, six hundred sixteen million, nine hundred eight thousand, eight hundred sixty-one".