51129019 has 4 divisors (see below), whose sum is σ = 53820040. Its totient is φ = 48438000.

The previous prime is 51129007. The next prime is 51129101. The reversal of 51129019 is 91092115.

51129019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91092115 = 5 ⋅18218423.

It is a cyclic number.

It is not a de Polignac number, because 51129019 - 2¹³ = 51120827 is a prime.

It is a super-2 number, since 2×51129019² = 5228353167804722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51129119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345482 + ... + 1345519.

It is an arithmetic number, because the mean of its divisors is an integer number (13455010).

Almost surely, 2^51129019 is an apocalyptic number.

51129019 is a deficient number, since it is larger than the sum of its proper divisors (2691021).

51129019 is a wasteful number, since it uses less digits than its factorization.

51129019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691020.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 51129019 is about 7150.4558595938. The cubic root of 51129019 is about 371.1554311759.

The spelling of 51129019 in words is "fifty-one million, one hundred twenty-nine thousand, nineteen".