48561991 has 4 divisors (see below), whose sum is σ = 48621400. Its totient is φ = 48502584.

The previous prime is 48561971. The next prime is 48562067. The reversal of 48561991 is 19916584.

48561991 is nontrivially palindromic in base 13.

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 48561991 - 2⁵ = 48561959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (48561971) 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, 28461 + ... + 30118.

It is an arithmetic number, because the mean of its divisors is an integer number (12155350).

Almost surely, 2^48561991 is an apocalyptic number.

48561991 is a deficient number, since it is larger than the sum of its proper divisors (59409).

48561991 is an equidigital number, since it uses as much as digits as its factorization.

48561991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59408.

The product of its digits is 77760, while the sum is 43.

The square root of 48561991 is about 6968.6434117409. The cubic root of 48561991 is about 364.8369597721.

The spelling of 48561991 in words is "forty-eight million, five hundred sixty-one thousand, nine hundred ninety-one".