49545991 has 6 divisors (see below), whose sum is σ = 54459776. Its totient is φ = 45041700.

The previous prime is 49545971. The next prime is 49546009. The reversal of 49545991 is 19954594.

It is a happy number.

It is not a de Polignac number, because 49545991 - 2⁵ = 49545959 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 (49545911) 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 5 ways as a sum of consecutive naturals, for example, 204615 + ... + 204856.

Almost surely, 2^49545991 is an apocalyptic number.

49545991 is a deficient number, since it is larger than the sum of its proper divisors (4913785).

49545991 is a wasteful number, since it uses less digits than its factorization.

49545991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409493 (or 409482 counting only the distinct ones).

The product of its digits is 291600, while the sum is 46.

The square root of 49545991 is about 7038.8913189507. The cubic root of 49545991 is about 367.2847021287.

It can be divided in two parts, 49545 and 991, that multiplied together give a triangular number (49099095 = T₉₉₀₉).

The spelling of 49545991 in words is "forty-nine million, five hundred forty-five thousand, nine hundred ninety-one".