51125550331 has 4 divisors (see below), whose sum is σ = 52774761664. Its totient is φ = 49476339000.

The previous prime is 51125550323. The next prime is 51125550361. The reversal of 51125550331 is 13305552115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13305552115 = 5 ⋅2661110423.

It is a cyclic number.

It is not a de Polignac number, because 51125550331 - 2³ = 51125550323 is a prime.

It is a super-2 number, since 2×51125550331² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1649211301 = 51125550331 / (5 + 1 + 1 + 2 + 5 + 5 + 5 + 0 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51125550293 and 51125550302.

It is not an unprimeable number, because it can be changed into a prime (51125550361) 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, 824605620 + ... + 824605681.

It is an arithmetic number, because the mean of its divisors is an integer number (13193690416).

Almost surely, 2^51125550331 is an apocalyptic number.

51125550331 is a deficient number, since it is larger than the sum of its proper divisors (1649211333).

51125550331 is a wasteful number, since it uses less digits than its factorization.

51125550331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649211332.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 51125550331 in words is "fifty-one billion, one hundred twenty-five million, five hundred fifty thousand, three hundred thirty-one".