616997421 has 12 divisors (see below), whose sum is σ = 891596160. Its totient is φ = 411157320.

The previous prime is 616997401. The next prime is 616997429. The reversal of 616997421 is 124799616.

616997421 is a `hidden beast` number, since 616 + 9 + 9 + 7 + 4 + 21 = 666.

It is not a de Polignac number, because 616997421 - 2¹⁴ = 616981037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616997429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10090 + ... + 36548.

It is an arithmetic number, because the mean of its divisors is an integer number (74299680).

Almost surely, 2^616997421 is an apocalyptic number.

It is an amenable number.

616997421 is a deficient number, since it is larger than the sum of its proper divisors (274598739).

616997421 is a wasteful number, since it uses less digits than its factorization.

616997421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29056 (or 29053 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 616997421 is about 24839.4327833789. The cubic root of 616997421 is about 851.3231622835.

The spelling of 616997421 in words is "six hundred sixteen million, nine hundred ninety-seven thousand, four hundred twenty-one".