51543631 has 4 divisors (see below), whose sum is σ = 52640352. Its totient is φ = 50446912.

The previous prime is 51543623. The next prime is 51543641. The reversal of 51543631 is 13634515.

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 51543631 - 2³ = 51543623 is a prime.

It is a super-2 number, since 2×51543631² = 5313491793328322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51543631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51543641) 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, 548290 + ... + 548383.

It is an arithmetic number, because the mean of its divisors is an integer number (13160088).

Almost surely, 2^51543631 is an apocalyptic number.

51543631 is a deficient number, since it is larger than the sum of its proper divisors (1096721).

51543631 is a wasteful number, since it uses less digits than its factorization.

51543631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096720.

The product of its digits is 5400, while the sum is 28.

The square root of 51543631 is about 7179.3893194338. The cubic root of 51543631 is about 372.1559810475.

It can be divided in two parts, 51 and 543631, that multiplied together give a triangular number (27725181 = T₇₄₄₆).

The spelling of 51543631 in words is "fifty-one million, five hundred forty-three thousand, six hundred thirty-one".