613522421 has 4 divisors (see below), whose sum is σ = 614568192. Its totient is φ = 612476652.

The previous prime is 613522411. The next prime is 613522433. The reversal of 613522421 is 124225316.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 613522421 - 2²⁶ = 546413557 is a prime.

It is a super-2 number, since 2×613522421² = 752819522139402482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613522411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522005 + ... + 523178.

It is an arithmetic number, because the mean of its divisors is an integer number (153642048).

Almost surely, 2^613522421 is an apocalyptic number.

It is an amenable number.

613522421 is a deficient number, since it is larger than the sum of its proper divisors (1045771).

613522421 is a wasteful number, since it uses less digits than its factorization.

613522421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045770.

The product of its digits is 2880, while the sum is 26.

The square root of 613522421 is about 24769.3847521492. The cubic root of 613522421 is about 849.7219025648.

Adding to 613522421 its reverse (124225316), we get a palindrome (737747737).

The spelling of 613522421 in words is "six hundred thirteen million, five hundred twenty-two thousand, four hundred twenty-one".