616469621 has 6 divisors (see below), whose sum is σ = 644438550. Its totient is φ = 589666088.

The previous prime is 616469593. The next prime is 616469639. The reversal of 616469621 is 126964616.

It can be written as a sum of positive squares in only one way, i.e., 605652100 + 10817521 = 24610^2 + 3289^2 .

It is a de Polignac number, because none of the positive numbers 2^k-616469621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616469671) 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, 582146 + ... + 583203.

It is an arithmetic number, because the mean of its divisors is an integer number (107406425).

Almost surely, 2^616469621 is an apocalyptic number.

It is an amenable number.

616469621 is a deficient number, since it is larger than the sum of its proper divisors (27968929).

616469621 is a wasteful number, since it uses less digits than its factorization.

616469621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165395 (or 1165372 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 616469621 is about 24828.8062741647. The cubic root of 616469621 is about 851.0803430355.

The spelling of 616469621 in words is "six hundred sixteen million, four hundred sixty-nine thousand, six hundred twenty-one".