616521081 has 16 divisors (see below), whose sum is σ = 902135808. Its totient is φ = 371408400.

The previous prime is 616521079. The next prime is 616521089. The reversal of 616521081 is 180125616.

It is not a de Polignac number, because 616521081 - 2¹ = 616521079 is a prime.

It is a super-2 number, since 2×616521081² = 760196486634817122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (616521089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50425 + ... + 61446.

It is an arithmetic number, because the mean of its divisors is an integer number (56383488).

Almost surely, 2^616521081 is an apocalyptic number.

It is an amenable number.

616521081 is a deficient number, since it is larger than the sum of its proper divisors (285614727).

616521081 is a wasteful number, since it uses less digits than its factorization.

616521081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112052.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 616521081 is about 24829.8425488363. The cubic root of 616521081 is about 851.1040237784.

Adding to 616521081 its reverse (180125616), we get a palindrome (796646697).

The spelling of 616521081 in words is "six hundred sixteen million, five hundred twenty-one thousand, eighty-one".