53861691 has 8 divisors (see below), whose sum is σ = 77339920. Its totient is φ = 33145632.

The previous prime is 53861669. The next prime is 53861693. The reversal of 53861691 is 19616835.

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

It is not a de Polignac number, because 53861691 - 2¹¹ = 53859643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1381069 = 53861691 / (5 + 3 + 8 + 6 + 1 + 6 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53861693) 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 7 ways as a sum of consecutive naturals, for example, 690496 + ... + 690573.

It is an arithmetic number, because the mean of its divisors is an integer number (9667490).

Almost surely, 2^53861691 is an apocalyptic number.

53861691 is a deficient number, since it is larger than the sum of its proper divisors (23478229).

53861691 is a wasteful number, since it uses less digits than its factorization.

53861691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381085.

The product of its digits is 38880, while the sum is 39.

The square root of 53861691 is about 7339.0524592757. The cubic root of 53861691 is about 377.6533382883.

The spelling of 53861691 in words is "fifty-three million, eight hundred sixty-one thousand, six hundred ninety-one".