48381991 has 12 divisors (see below), whose sum is σ = 56104752. Its totient is φ = 40870656.

The previous prime is 48381953. The next prime is 48381997. The reversal of 48381991 is 19918384.

It is not a de Polignac number, because 48381991 - 2²⁵ = 14827559 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (48381997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36655 + ... + 37951.

It is an arithmetic number, because the mean of its divisors is an integer number (4675396).

Almost surely, 2^48381991 is an apocalyptic number.

48381991 is a deficient number, since it is larger than the sum of its proper divisors (7722761).

48381991 is an equidigital number, since it uses as much as digits as its factorization.

48381991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450 (or 1377 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 48381991 is about 6955.7164260772. The cubic root of 48381991 is about 364.3856331465.

The spelling of 48381991 in words is "forty-eight million, three hundred eighty-one thousand, nine hundred ninety-one".