616147421 has 4 divisors (see below), whose sum is σ = 632800092. Its totient is φ = 599494752.

The previous prime is 616147417. The next prime is 616147423. The reversal of 616147421 is 124741616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 466084921 + 150062500 = 21589^2 + 12250^2 .

It is a cyclic number.

It is not a de Polignac number, because 616147421 - 2² = 616147417 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 (616147423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8326280 + ... + 8326353.

It is an arithmetic number, because the mean of its divisors is an integer number (158200023).

Almost surely, 2^616147421 is an apocalyptic number.

It is an amenable number.

616147421 is a deficient number, since it is larger than the sum of its proper divisors (16652671).

616147421 is a wasteful number, since it uses less digits than its factorization.

616147421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16652670.

The product of its digits is 8064, while the sum is 32.

The square root of 616147421 is about 24822.3169949946. The cubic root of 616147421 is about 850.9320438251.

The spelling of 616147421 in words is "six hundred sixteen million, one hundred forty-seven thousand, four hundred twenty-one".