121823623949 has 4 divisors (see below), whose sum is σ = 125116154364. Its totient is φ = 118531093536.

The previous prime is 121823623937. The next prime is 121823623967. The reversal of 121823623949 is 949326328121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115434819049 + 6388804900 = 339757^2 + 79930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121823623949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121823623897 and 121823623906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121823623549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1646265152 + ... + 1646265225.

It is an arithmetic number, because the mean of its divisors is an integer number (31279038591).

Almost surely, 2^121823623949 is an apocalyptic number.

It is an amenable number.

121823623949 is a deficient number, since it is larger than the sum of its proper divisors (3292530415).

121823623949 is an equidigital number, since it uses as much as digits as its factorization.

121823623949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292530414.

The product of its digits is 1119744, while the sum is 50.

The spelling of 121823623949 in words is "one hundred twenty-one billion, eight hundred twenty-three million, six hundred twenty-three thousand, nine hundred forty-nine".