53909691 has 8 divisors (see below), whose sum is σ = 78414144. Its totient is φ = 32672520.

The previous prime is 53909689. The next prime is 53909699. The reversal of 53909691 is 19690935.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53909691 - 2¹ = 53909689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53909699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816781 + ... + 816846.

It is an arithmetic number, because the mean of its divisors is an integer number (9801768).

Almost surely, 2^53909691 is an apocalyptic number.

53909691 is a deficient number, since it is larger than the sum of its proper divisors (24504453).

53909691 is a wasteful number, since it uses less digits than its factorization.

53909691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633641.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 53909691 is about 7342.3219079526. The cubic root of 53909691 is about 377.7654896009.

The spelling of 53909691 in words is "fifty-three million, nine hundred nine thousand, six hundred ninety-one".