53511691 has 4 divisors (see below), whose sum is σ = 53705152. Its totient is φ = 53318232.

The previous prime is 53511659. The next prime is 53511707. The reversal of 53511691 is 19611535.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53511691 - 2⁵ = 53511659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53518691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96315 + ... + 96868.

It is an arithmetic number, because the mean of its divisors is an integer number (13426288).

Almost surely, 2^53511691 is an apocalyptic number.

53511691 is a deficient number, since it is larger than the sum of its proper divisors (193461).

53511691 is a wasteful number, since it uses less digits than its factorization.

53511691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193460.

The product of its digits is 4050, while the sum is 31.

The square root of 53511691 is about 7315.1685558161. The cubic root of 53511691 is about 376.8335471497.

The spelling of 53511691 in words is "fifty-three million, five hundred eleven thousand, six hundred ninety-one".