51810231002 has 8 divisors (see below), whose sum is σ = 77716312212. Its totient is φ = 25904793600.

The previous prime is 51810231001. The next prime is 51810231007. The reversal of 51810231002 is 20013201815.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50462680321 + 1347550681 = 224639^2 + 36709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51810231001) 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, 240602 + ... + 401882.

Almost surely, 2^51810231002 is an apocalyptic number.

51810231002 is a deficient number, since it is larger than the sum of its proper divisors (25906081210).

51810231002 is a wasteful number, since it uses less digits than its factorization.

51810231002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321904.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 51810231002 its reverse (20013201815), we get a palindrome (71823432817).

The spelling of 51810231002 in words is "fifty-one billion, eight hundred ten million, two hundred thirty-one thousand, two".