49509091 has 4 divisors (see below), whose sum is σ = 50019592. Its totient is φ = 48998592.

The previous prime is 49509037. The next prime is 49509107. The reversal of 49509091 is 19090594.

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 49509091 - 2¹⁷ = 49378019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49509091.

It is not an unprimeable number, because it can be changed into a prime (49509191) 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, 255105 + ... + 255298.

It is an arithmetic number, because the mean of its divisors is an integer number (12504898).

Almost surely, 2^49509091 is an apocalyptic number.

49509091 is a deficient number, since it is larger than the sum of its proper divisors (510501).

49509091 is an equidigital number, since it uses as much as digits as its factorization.

49509091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510500.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 49509091 is about 7036.2696793116. The cubic root of 49509091 is about 367.1934995163.

It can be divided in two parts, 4950 and 9091, that added together give a palindrome (14041).

The spelling of 49509091 in words is "forty-nine million, five hundred nine thousand, ninety-one".