123897194989 has 4 divisors (see below), whose sum is σ = 123897905856. Its totient is φ = 123896484124.

The previous prime is 123897194983. The next prime is 123897195007. The reversal of 123897194989 is 989491798321.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 123897194989 - 2³¹ = 121749711341 is a prime.

It is a super-2 number, since 2×123897194989² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123897194983) 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, 103692 + ... + 508474.

It is an arithmetic number, because the mean of its divisors is an integer number (30974476464).

Almost surely, 2^123897194989 is an apocalyptic number.

It is an amenable number.

123897194989 is a deficient number, since it is larger than the sum of its proper divisors (710867).

123897194989 is an equidigital number, since it uses as much as digits as its factorization.

123897194989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710866.

The product of its digits is 70543872, while the sum is 70.

The spelling of 123897194989 in words is "one hundred twenty-three billion, eight hundred ninety-seven million, one hundred ninety-four thousand, nine hundred eighty-nine".