49509681 has 16 divisors (see below), whose sum is σ = 71320704. Its totient is φ = 30369024.

The previous prime is 49509643. The next prime is 49509689. The reversal of 49509681 is 18690594.

It is not a de Polignac number, because 49509681 - 2⁶ = 49509617 is a prime.

It is a super-2 number, since 2×49509681² = 4902417025443522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (49509689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11260 + ... + 15026.

It is an arithmetic number, because the mean of its divisors is an integer number (4457544).

Almost surely, 2^49509681 is an apocalyptic number.

It is an amenable number.

49509681 is a deficient number, since it is larger than the sum of its proper divisors (21811023).

49509681 is a wasteful number, since it uses less digits than its factorization.

49509681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 49509681 is about 7036.3116048111. The cubic root of 49509681 is about 367.1949581259.

The spelling of 49509681 in words is "forty-nine million, five hundred nine thousand, six hundred eighty-one".