53811691 has 8 divisors (see below), whose sum is σ = 56070144. Its totient is φ = 51585960.

The previous prime is 53811677. The next prime is 53811707. The reversal of 53811691 is 19611835.

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

It is a cyclic number.

It is not a de Polignac number, because 53811691 - 2⁹ = 53811179 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (53811631) 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, 4795 + ... + 11428.

It is an arithmetic number, because the mean of its divisors is an integer number (7008768).

Almost surely, 2^53811691 is an apocalyptic number.

53811691 is a deficient number, since it is larger than the sum of its proper divisors (2258453).

53811691 is a wasteful number, since it uses less digits than its factorization.

53811691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16361.

The product of its digits is 6480, while the sum is 34.

The square root of 53811691 is about 7335.6452340609. The cubic root of 53811691 is about 377.5364431288.

The spelling of 53811691 in words is "fifty-three million, eight hundred eleven thousand, six hundred ninety-one".