1616515541 has 2 divisors, whose sum is σ = 1616515542. Its totient is φ = 1616515540.

The previous prime is 1616515517. The next prime is 1616515559. The reversal of 1616515541 is 1455156161.

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., 946792900 + 669722641 = 30770^2 + 25879^2 .

It is an emirp because it is prime and its reverse (1455156161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1616515541 - 2¹⁰ = 1616514517 is a prime.

It is a super-2 number, since 2×1616515541² = 5226244988589045362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616515591) 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, 808257770 + 808257771.

It is an arithmetic number, because the mean of its divisors is an integer number (808257771).

Almost surely, 2^1616515541 is an apocalyptic number.

It is an amenable number.

1616515541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616515541 is an equidigital number, since it uses as much as digits as its factorization.

1616515541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 35.

The square root of 1616515541 is about 40205.9142540000. The cubic root of 1616515541 is about 1173.6176387843.

The spelling of 1616515541 in words is "one billion, six hundred sixteen million, five hundred fifteen thousand, five hundred forty-one".