51001211572 has 12 divisors (see below), whose sum is σ = 92329779780. Its totient is φ = 24621274496.

The previous prime is 51001211483. The next prime is 51001211579. The reversal of 51001211572 is 27511210015.

It can be written as a sum of positive squares in 2 ways, for example, as 29027299876 + 21973911696 = 170374^2 + 148236^2 .

It is a super-2 number, since 2×51001211572² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51001211579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219832693 + ... + 219832924.

It is an arithmetic number, because the mean of its divisors is an integer number (7694148315).

Almost surely, 2^51001211572 is an apocalyptic number.

It is an amenable number.

51001211572 is a deficient number, since it is larger than the sum of its proper divisors (41328568208).

51001211572 is a wasteful number, since it uses less digits than its factorization.

51001211572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439665650 (or 439665648 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 25.

Adding to 51001211572 its reverse (27511210015), we get a palindrome (78512421587).

The spelling of 51001211572 in words is "fifty-one billion, one million, two hundred eleven thousand, five hundred seventy-two".