51531101 has 4 divisors (see below), whose sum is σ = 51578112. Its totient is φ = 51484092.

The previous prime is 51531079. The next prime is 51531113. The reversal of 51531101 is 10113515.

51531101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51531101 - 2²² = 47336797 is a prime.

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 51531101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21821 + ... + 24066.

It is an arithmetic number, because the mean of its divisors is an integer number (12894528).

Almost surely, 2^51531101 is an apocalyptic number.

It is an amenable number.

51531101 is a deficient number, since it is larger than the sum of its proper divisors (47011).

51531101 is a wasteful number, since it uses less digits than its factorization.

51531101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47010.

The product of its (nonzero) digits is 75, while the sum is 17.

The square root of 51531101 is about 7178.5166294994. The cubic root of 51531101 is about 372.1258221817.

Adding to 51531101 its reverse (10113515), we get a palindrome (61644616).

The spelling of 51531101 in words is "fifty-one million, five hundred thirty-one thousand, one hundred one".