51315719 has 16 divisors (see below), whose sum is σ = 63329280. Its totient is φ = 40491360.

The previous prime is 51315683. The next prime is 51315721. The reversal of 51315719 is 91751315.

It is a happy number.

It is not a de Polignac number, because 51315719 - 2¹⁶ = 51250183 is a prime.

It is a super-2 number, since 2×51315719² = 5266606032973922, which contains 22 as substring.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51315739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55874 + ... + 56784.

It is an arithmetic number, because the mean of its divisors is an integer number (3958080).

Almost surely, 2^51315719 is an apocalyptic number.

51315719 is a deficient number, since it is larger than the sum of its proper divisors (12013561).

51315719 is a wasteful number, since it uses less digits than its factorization.

51315719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550.

The product of its digits is 4725, while the sum is 32.

The square root of 51315719 is about 7163.4990751727. The cubic root of 51315719 is about 371.6066462050.

The spelling of 51315719 in words is "fifty-one million, three hundred fifteen thousand, seven hundred nineteen".