51320719 has 4 divisors (see below), whose sum is σ = 51473344. Its totient is φ = 51168096.

The previous prime is 51320699. The next prime is 51320723. The reversal of 51320719 is 91702315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91702315 = 5 ⋅18340463.

It is a cyclic number.

It is not a de Polignac number, because 51320719 - 2⁹ = 51320207 is a prime.

It is a super-2 number, since 2×51320719² = 5267632397353922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51320519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75807 + ... + 76480.

It is an arithmetic number, because the mean of its divisors is an integer number (12868336).

Almost surely, 2^51320719 is an apocalyptic number.

51320719 is a deficient number, since it is larger than the sum of its proper divisors (152625).

51320719 is a wasteful number, since it uses less digits than its factorization.

51320719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152624.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 51320719 is about 7163.8480581319. The cubic root of 51320719 is about 371.6187151053.

The spelling of 51320719 in words is "fifty-one million, three hundred twenty thousand, seven hundred nineteen".