1616655121 has 2 divisors, whose sum is σ = 1616655122. Its totient is φ = 1616655120.

The previous prime is 1616655091. The next prime is 1616655197. The reversal of 1616655121 is 1215566161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 959450625 + 657204496 = 30975^2 + 25636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616655121 - 2²¹ = 1614557969 is a prime.

It is a super-2 number, since 2×1616655121² = 5227147560511049282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1616655421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808327560 + 808327561.

It is an arithmetic number, because the mean of its divisors is an integer number (808327561).

Almost surely, 2^1616655121 is an apocalyptic number.

It is an amenable number.

1616655121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616655121 is an equidigital number, since it uses as much as digits as its factorization.

1616655121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 1616655121 is about 40207.6500308088. The cubic root of 1616655121 is about 1173.6514169595.

The spelling of 1616655121 in words is "one billion, six hundred sixteen million, six hundred fifty-five thousand, one hundred twenty-one".