53781631 has 8 divisors (see below), whose sum is σ = 55777680. Its totient is φ = 51795072.

The previous prime is 53781601. The next prime is 53781653. The reversal of 53781631 is 13618735.

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 53781631 - 2⁵ = 53781599 is a prime.

It is a super-2 number, since 2×53781631² = 5784927666040322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53781601) 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, 10416 + ... + 14698.

It is an arithmetic number, because the mean of its divisors is an integer number (6972210).

Almost surely, 2^53781631 is an apocalyptic number.

53781631 is a deficient number, since it is larger than the sum of its proper divisors (1996049).

53781631 is a wasteful number, since it uses less digits than its factorization.

53781631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745.

The product of its digits is 15120, while the sum is 34.

The square root of 53781631 is about 7333.5960483245. The cubic root of 53781631 is about 377.4661309029.

The spelling of 53781631 in words is "fifty-three million, seven hundred eighty-one thousand, six hundred thirty-one".