613233561 has 4 divisors (see below), whose sum is σ = 817644752. Its totient is φ = 408822372.

The previous prime is 613233539. The next prime is 613233563. The reversal of 613233561 is 165332316.

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 not a de Polignac number, because 613233561 - 2⁶ = 613233497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613233563) 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, 102205591 + ... + 102205596.

It is an arithmetic number, because the mean of its divisors is an integer number (204411188).

Almost surely, 2^613233561 is an apocalyptic number.

It is an amenable number.

613233561 is a deficient number, since it is larger than the sum of its proper divisors (204411191).

613233561 is a wasteful number, since it uses less digits than its factorization.

613233561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204411190.

The product of its digits is 9720, while the sum is 30.

The square root of 613233561 is about 24763.5530770526. The cubic root of 613233561 is about 849.5885256407.

Adding to 613233561 its reverse (165332316), we get a palindrome (778565877).

It can be divided in two parts, 6132 and 33561, that added together give a palindrome (39693).

The spelling of 613233561 in words is "six hundred thirteen million, two hundred thirty-three thousand, five hundred sixty-one".