613765421 has 4 divisors (see below), whose sum is σ = 617313372. Its totient is φ = 610217472.

The previous prime is 613765409. The next prime is 613765429. The reversal of 613765421 is 124567316.

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 551592196 + 62173225 = 23486^2 + 7885^2 .

It is a cyclic number.

It is not a de Polignac number, because 613765421 - 2⁶ = 613765357 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 (613765429) 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 3 ways as a sum of consecutive naturals, for example, 1773716 + ... + 1774061.

It is an arithmetic number, because the mean of its divisors is an integer number (154328343).

Almost surely, 2^613765421 is an apocalyptic number.

It is an amenable number.

613765421 is a deficient number, since it is larger than the sum of its proper divisors (3547951).

613765421 is a wasteful number, since it uses less digits than its factorization.

613765421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547950.

The product of its digits is 30240, while the sum is 35.

The square root of 613765421 is about 24774.2895155441. The cubic root of 613765421 is about 849.8340718789.

The spelling of 613765421 in words is "six hundred thirteen million, seven hundred sixty-five thousand, four hundred twenty-one".