51155719 has 8 divisors (see below), whose sum is σ = 52709648. Its totient is φ = 49610880.

The previous prime is 51155711. The next prime is 51155729. The reversal of 51155719 is 91755115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51155719 - 2³ = 51155711 is a prime.

It is a super-2 number, since 2×51155719² = 5233815172813922, 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 (51155711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10159 + ... + 14335.

It is an arithmetic number, because the mean of its divisors is an integer number (6588706).

Almost surely, 2^51155719 is an apocalyptic number.

51155719 is a deficient number, since it is larger than the sum of its proper divisors (1553929).

51155719 is a wasteful number, since it uses less digits than its factorization.

51155719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545.

The product of its digits is 7875, while the sum is 34.

The square root of 51155719 is about 7152.3226297476. The cubic root of 51155719 is about 371.2200267533.

The spelling of 51155719 in words is "fifty-one million, one hundred fifty-five thousand, seven hundred nineteen".