47777121 has 20 divisors (see below), whose sum is σ = 81567552. Its totient is φ = 27300888.

The previous prime is 47777117. The next prime is 47777131. The reversal of 47777121 is 12177774.

It is not a de Polignac number, because 47777121 - 2² = 47777117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47777111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41565 + ... + 42698.

Almost surely, 2^47777121 is an apocalyptic number.

It is an amenable number.

47777121 is a deficient number, since it is larger than the sum of its proper divisors (33790431).

47777121 is an equidigital number, since it uses as much as digits as its factorization.

47777121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84282 (or 84273 counting only the distinct ones).

The product of its digits is 19208, while the sum is 36.

The square root of 47777121 is about 6912.0996086573. The cubic root of 47777121 is about 362.8607484459.

The spelling of 47777121 in words is "forty-seven million, seven hundred seventy-seven thousand, one hundred twenty-one".