51551543 has 4 divisors (see below), whose sum is σ = 53214528. Its totient is φ = 49888560.

The previous prime is 51551537. The next prime is 51551557. The reversal of 51551543 is 34515515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34515515 = 5 ⋅6903103.

It is a cyclic number.

It is not a de Polignac number, because 51551543 - 2²² = 47357239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551573) 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, 831446 + ... + 831507.

It is an arithmetic number, because the mean of its divisors is an integer number (13303632).

Almost surely, 2^51551543 is an apocalyptic number.

51551543 is a deficient number, since it is larger than the sum of its proper divisors (1662985).

51551543 is a wasteful number, since it uses less digits than its factorization.

51551543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662984.

The product of its digits is 7500, while the sum is 29.

The square root of 51551543 is about 7179.9403200862. The cubic root of 51551543 is about 372.1750221810.

The spelling of 51551543 in words is "fifty-one million, five hundred fifty-one thousand, five hundred forty-three".