51311172 has 96 divisors (see below), whose sum is σ = 141120000. Its totient is φ = 14342400.

The previous prime is 51311171. The next prime is 51311207. The reversal of 51311172 is 27111315.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51311171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102579 + ... + 103077.

It is an arithmetic number, because the mean of its divisors is an integer number (1470000).

Almost surely, 2^51311172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51311172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70560000).

51311172 is an abundant number, since it is smaller than the sum of its proper divisors (89808828).

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

51311172 is a wasteful number, since it uses less digits than its factorization.

51311172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 575 counting only the distinct ones).

The product of its digits is 210, while the sum is 21.

The square root of 51311172 is about 7163.1816953083. The cubic root of 51311172 is about 371.5956700664.

Adding to 51311172 its reverse (27111315), we get a palindrome (78422487).

It can be divided in two parts, 513 and 11172, that multiplied together give a square (5731236 = 2394²).

The spelling of 51311172 in words is "fifty-one million, three hundred eleven thousand, one hundred seventy-two".