623513561 has 8 divisors (see below), whose sum is σ = 680761344. Its totient is φ = 566359920.

The previous prime is 623513533. The next prime is 623513567. The reversal of 623513561 is 165315326.

623513561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 623513561 - 2⁶ = 623513497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (623513567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9305 + ... + 36518.

It is an arithmetic number, because the mean of its divisors is an integer number (85095168).

Almost surely, 2^623513561 is an apocalyptic number.

It is an amenable number.

623513561 is a deficient number, since it is larger than the sum of its proper divisors (57247783).

623513561 is a wasteful number, since it uses less digits than its factorization.

623513561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47071.

The product of its digits is 16200, while the sum is 32.

The square root of 623513561 is about 24970.2535229421. The cubic root of 623513561 is about 854.3096286345.

Adding to 623513561 its reverse (165315326), we get a palindrome (788828887).

The spelling of 623513561 in words is "six hundred twenty-three million, five hundred thirteen thousand, five hundred sixty-one".