623001561 has 16 divisors (see below), whose sum is σ = 1022361984. Its totient is φ = 328616064.

The previous prime is 623001557. The next prime is 623001563. The reversal of 623001561 is 165100326.

It is not a de Polignac number, because 623001561 - 2² = 623001557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (623001563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1140756 + ... + 1141301.

It is an arithmetic number, because the mean of its divisors is an integer number (63897624).

Almost surely, 2^623001561 is an apocalyptic number.

It is an amenable number.

623001561 is a deficient number, since it is larger than the sum of its proper divisors (399360423).

623001561 is a wasteful number, since it uses less digits than its factorization.

623001561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282080.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 623001561 is about 24959.9992187500. Note that the first 3 decimals coincide. The cubic root of 623001561 is about 854.0757249753.

Adding to 623001561 its reverse (165100326), we get a palindrome (788101887).

The spelling of 623001561 in words is "six hundred twenty-three million, one thousand, five hundred sixty-one".