51131445 has 16 divisors (see below), whose sum is σ = 82000320. Its totient is φ = 27206784.

The previous prime is 51131417. The next prime is 51131449. The reversal of 51131445 is 54413115.

It is a happy number.

It is not a de Polignac number, because 51131445 - 2¹⁰ = 51130421 is a prime.

It is a super-3 number, since 3×51131445³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3126 + ... + 10584.

It is an arithmetic number, because the mean of its divisors is an integer number (5125020).

Almost surely, 2^51131445 is an apocalyptic number.

It is an amenable number.

51131445 is a deficient number, since it is larger than the sum of its proper divisors (30868875).

51131445 is a wasteful number, since it uses less digits than its factorization.

51131445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924.

The product of its digits is 1200, while the sum is 24.

The square root of 51131445 is about 7150.6254971156. The cubic root of 51131445 is about 371.1613013507.

The spelling of 51131445 in words is "fifty-one million, one hundred thirty-one thousand, four hundred forty-five".