51706212100 has 27 divisors (see below), whose sum is σ = 112207414837. Its totient is φ = 20681575280.

The previous prime is 51706212083. The next prime is 51706212109. The reversal of 51706212100 is 121260715.

The square root of 51706212100 is 227390.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18614236356 + 33091975744 = 136434^2 + 181912^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51706212109) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2262531 + ... + 2285269.

Almost surely, 2^51706212100 is an apocalyptic number.

51706212100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51706212100 is the 227390-th square number.

It is an amenable number.

51706212100 is an abundant number, since it is smaller than the sum of its proper divisors (60501202737).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51706212100 is an frugal number, since it uses more digits than its factorization.

51706212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45492 (or 22746 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

Multiplying 51706212100 by its sum of digits (25), we get a square (1292655302500 = 1136950²).

51706212100 divided by its sum of digits (25) gives a square (2068248484 = 45478²).

Adding to 51706212100 its reverse (121260715), we get a palindrome (51827472815).

The spelling of 51706212100 in words is "fifty-one billion, seven hundred six million, two hundred twelve thousand, one hundred".