56123513 has 4 divisors (see below), whose sum is σ = 56147280. Its totient is φ = 56099748.

The previous prime is 56123467. The next prime is 56123537. The reversal of 56123513 is 31532165.

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 56123513 - 2¹⁶ = 56057977 is a prime.

It is a super-2 number, since 2×56123513² = 6299697422922338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56123813) 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, 7895 + ... + 13212.

It is an arithmetic number, because the mean of its divisors is an integer number (14036820).

Almost surely, 2^56123513 is an apocalyptic number.

It is an amenable number.

56123513 is a deficient number, since it is larger than the sum of its proper divisors (23767).

56123513 is a wasteful number, since it uses less digits than its factorization.

56123513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23766.

The product of its digits is 2700, while the sum is 26.

The square root of 56123513 is about 7491.5627875631. The cubic root of 56123513 is about 382.8673060491.

Adding to 56123513 its reverse (31532165), we get a palindrome (87655678).

The spelling of 56123513 in words is "fifty-six million, one hundred twenty-three thousand, five hundred thirteen".