51371340 has 96 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 13036800.

The previous prime is 51371339. The next prime is 51371347. The reversal of 51371340 is 4317315.

It is a self number, because there is not a number n which added to its sum of digits gives 51371340.

It is not an unprimeable number, because it can be changed into a prime (51371347) 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, 131866 + ... + 132254.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^51371340 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 51371340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75479040).

51371340 is an abundant number, since it is smaller than the sum of its proper divisors (99586740).

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

51371340 is a wasteful number, since it uses less digits than its factorization.

51371340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 51371340 is about 7167.3802745494. The cubic root of 51371340 is about 371.7408589467.

Adding to 51371340 its reverse (4317315), we get a palindrome (55688655).

The spelling of 51371340 in words is "fifty-one million, three hundred seventy-one thousand, three hundred forty".