1616521531 has 2 divisors, whose sum is σ = 1616521532. Its totient is φ = 1616521530.

The previous prime is 1616521513. The next prime is 1616521537. The reversal of 1616521531 is 1351256161.

It is a happy number.

Together with previous prime (1616521513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (1351256161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1616521531 - 2¹¹ = 1616519483 is a prime.

It is a super-2 number, since 2×1616521531² = 5226283720373167922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616521493 and 1616521502.

It is not a weakly prime, because it can be changed into another prime (1616521537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808260765 + 808260766.

It is an arithmetic number, because the mean of its divisors is an integer number (808260766).

Almost surely, 2^1616521531 is an apocalyptic number.

1616521531 is the 25429-th centered pentagonal number.

1616521531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616521531 is an equidigital number, since it uses as much as digits as its factorization.

1616521531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 1616521531 is about 40205.9887454593. The cubic root of 1616521531 is about 1173.6190883963.

Adding to 1616521531 its reverse (1351256161), we get a palindrome (2967777692).

The spelling of 1616521531 in words is "one billion, six hundred sixteen million, five hundred twenty-one thousand, five hundred thirty-one".