49191789 has 4 divisors (see below), whose sum is σ = 65589056. Its totient is φ = 32794524.

The previous prime is 49191787. The next prime is 49191797. The reversal of 49191789 is 98719194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 49191789 - 2¹ = 49191787 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 (49191787) 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, 8198629 + ... + 8198634.

It is an arithmetic number, because the mean of its divisors is an integer number (16397264).

Almost surely, 2^49191789 is an apocalyptic number.

It is an amenable number.

49191789 is a deficient number, since it is larger than the sum of its proper divisors (16397267).

49191789 is a wasteful number, since it uses less digits than its factorization.

49191789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16397266.

The product of its digits is 163296, while the sum is 48.

The square root of 49191789 is about 7013.6858355646. The cubic root of 49191789 is about 366.4073743494.

The spelling of 49191789 in words is "forty-nine million, one hundred ninety-one thousand, seven hundred eighty-nine".