616046021 has 2 divisors, whose sum is σ = 616046022. Its totient is φ = 616046020.

The previous prime is 616046009. The next prime is 616046047. The reversal of 616046021 is 120640616.

It is a happy number.

It is an a-pointer prime, because the next prime (616046047) can be obtained adding 616046021 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 568297921 + 47748100 = 23839^2 + 6910^2 .

It is a cyclic number.

It is not a de Polignac number, because 616046021 - 2⁶ = 616045957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616046621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308023010 + 308023011.

It is an arithmetic number, because the mean of its divisors is an integer number (308023011).

Almost surely, 2^616046021 is an apocalyptic number.

It is an amenable number.

616046021 is a deficient number, since it is larger than the sum of its proper divisors (1).

616046021 is an equidigital number, since it uses as much as digits as its factorization.

616046021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 616046021 is about 24820.2743941319. The cubic root of 616046021 is about 850.8853616837.

Adding to 616046021 its reverse (120640616), we get a palindrome (736686637).

The spelling of 616046021 in words is "six hundred sixteen million, forty-six thousand, twenty-one".