623111261 has 4 divisors (see below), whose sum is σ = 623237472. Its totient is φ = 622985052.

The previous prime is 623111249. The next prime is 623111263. The reversal of 623111261 is 162111326.

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 623111261 - 2¹⁰ = 623110237 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 (623111263) 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, 55385 + ... + 65678.

It is an arithmetic number, because the mean of its divisors is an integer number (155809368).

Almost surely, 2^623111261 is an apocalyptic number.

It is an amenable number.

623111261 is a deficient number, since it is larger than the sum of its proper divisors (126211).

623111261 is a wasteful number, since it uses less digits than its factorization.

623111261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126210.

The product of its digits is 432, while the sum is 23.

The square root of 623111261 is about 24962.1966381166. The cubic root of 623111261 is about 854.1258514460.

Adding to 623111261 its reverse (162111326), we get a palindrome (785222587).

The spelling of 623111261 in words is "six hundred twenty-three million, one hundred eleven thousand, two hundred sixty-one".