49724509 has 4 divisors (see below), whose sum is σ = 49766716. Its totient is φ = 49682304.

The previous prime is 49724503. The next prime is 49724533. The reversal of 49724509 is 90542794.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90542794 = 2 ⋅45271397.

It can be written as a sum of positive squares in 2 ways, for example, as 4202500 + 45522009 = 2050^2 + 6747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49724509 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 (49724503) 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, 19284 + ... + 21709.

It is an arithmetic number, because the mean of its divisors is an integer number (12441679).

Almost surely, 2^49724509 is an apocalyptic number.

It is an amenable number.

49724509 is a deficient number, since it is larger than the sum of its proper divisors (42207).

49724509 is a wasteful number, since it uses less digits than its factorization.

49724509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42206.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 49724509 is about 7051.5607492242. The cubic root of 49724509 is about 367.7252916956.

The spelling of 49724509 in words is "forty-nine million, seven hundred twenty-four thousand, five hundred nine".