10123456789 has 4 divisors (see below), whose sum is σ = 10134473440. Its totient is φ = 10112440140.

The previous prime is 10123456757. The next prime is 10123456799. The reversal of 10123456789 is 98765432101.

10123456789 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 10123456789 - 2⁵ = 10123456757 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is the 91-st primeval number, because it sets a new record (2970505) in the number of distinct primes that is it possible to write using its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10123456799) 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, 5506947 + ... + 5508784.

It is an arithmetic number, because the mean of its divisors is an integer number (2533618360).

It is a 2-persistent number, because it is pandigital, and so is 2⋅10123456789 = 20246913578, but 3⋅10123456789 = 30370370367 is not.

Almost surely, 2^10123456789 is an apocalyptic number.

It is an amenable number.

10123456789 is a deficient number, since it is larger than the sum of its proper divisors (11016651).

10123456789 is an equidigital number, since it uses as much as digits as its factorization.

10123456789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11016650.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 10123456789 in words is "ten billion, one hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine".