124487477891 has 4 divisors (see below), whose sum is σ = 142271403312. Its totient is φ = 106703552472.

The previous prime is 124487477771. The next prime is 124487477929. The reversal of 124487477891 is 198774784421.

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

It is a cyclic number.

It is not a de Polignac number, because 124487477891 - 2¹⁴ = 124487461507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124487477591) 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, 8891962700 + ... + 8891962713.

It is an arithmetic number, because the mean of its divisors is an integer number (35567850828).

Almost surely, 2^124487477891 is an apocalyptic number.

124487477891 is a deficient number, since it is larger than the sum of its proper divisors (17783925421).

124487477891 is an equidigital number, since it uses as much as digits as its factorization.

124487477891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17783925420.

The product of its digits is 25288704, while the sum is 62.

The spelling of 124487477891 in words is "one hundred twenty-four billion, four hundred eighty-seven million, four hundred seventy-seven thousand, eight hundred ninety-one".