51641551 has 4 divisors (see below), whose sum is σ = 55613992. Its totient is φ = 47669112.

The previous prime is 51641549. The next prime is 51641621. The reversal of 51641551 is 15514615.

It is a happy number.

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 51641551 - 2¹ = 51641549 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 (51641531) 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 3 ways as a sum of consecutive naturals, for example, 1986201 + ... + 1986226.

It is an arithmetic number, because the mean of its divisors is an integer number (13903498).

Almost surely, 2^51641551 is an apocalyptic number.

51641551 is a deficient number, since it is larger than the sum of its proper divisors (3972441).

51641551 is a wasteful number, since it uses less digits than its factorization.

51641551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972440.

The product of its digits is 3000, while the sum is 28.

The square root of 51641551 is about 7186.2056051855. The cubic root of 51641551 is about 372.3914997119.

The spelling of 51641551 in words is "fifty-one million, six hundred forty-one thousand, five hundred fifty-one".