6123377921 has 4 divisors (see below), whose sum is σ = 6272728644. Its totient is φ = 5974027200.

The previous prime is 6123377903. The next prime is 6123377959. The reversal of 6123377921 is 1297733216.

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 1984257025 + 4139120896 = 44545^2 + 64336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6123377921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 149350681 = 6123377921 / (6 + 1 + 2 + 3 + 3 + 7 + 7 + 9 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6123377621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74675300 + ... + 74675381.

It is an arithmetic number, because the mean of its divisors is an integer number (1568182161).

Almost surely, 2^6123377921 is an apocalyptic number.

It is an amenable number.

6123377921 is a deficient number, since it is larger than the sum of its proper divisors (149350723).

6123377921 is a wasteful number, since it uses less digits than its factorization.

6123377921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149350722.

The product of its digits is 95256, while the sum is 41.

The square root of 6123377921 is about 78252.0154436932. The cubic root of 6123377921 is about 1829.4913255692.

The spelling of 6123377921 in words is "six billion, one hundred twenty-three million, three hundred seventy-seven thousand, nine hundred twenty-one".