616101021 has 6 divisors (see below), whose sum is σ = 889923710. Its totient is φ = 410734008.

The previous prime is 616101019. The next prime is 616101053. The reversal of 616101021 is 120101616.

It can be written as a sum of positive squares in only one way, i.e., 478296900 + 137804121 = 21870^2 + 11739^2 .

It is not a de Polignac number, because 616101021 - 2¹ = 616101019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 616100985 and 616101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616101001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34227826 + ... + 34227843.

Almost surely, 2^616101021 is an apocalyptic number.

It is an amenable number.

616101021 is a deficient number, since it is larger than the sum of its proper divisors (273822689).

616101021 is a wasteful number, since it uses less digits than its factorization.

616101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68455675 (or 68455672 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 616101021 is about 24821.3823345921. The cubic root of 616101021 is about 850.9106830075.

Adding to 616101021 its reverse (120101616), we get a palindrome (736202637).

The spelling of 616101021 in words is "six hundred sixteen million, one hundred one thousand, twenty-one".