51145017229 has 4 divisors (see below), whose sum is σ = 51158199420. Its totient is φ = 51131835040.

The previous prime is 51145017227. The next prime is 51145017257. The reversal of 51145017229 is 92271054115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36607168900 + 14537848329 = 191330^2 + 120573^2 .

It is a cyclic number.

It is not a de Polignac number, because 51145017229 - 2¹ = 51145017227 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145017221) 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, 6585274 + ... + 6593035.

It is an arithmetic number, because the mean of its divisors is an integer number (12789549855).

Almost surely, 2^51145017229 is an apocalyptic number.

It is an amenable number.

51145017229 is a deficient number, since it is larger than the sum of its proper divisors (13182191).

51145017229 is a wasteful number, since it uses less digits than its factorization.

51145017229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13182190.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 51145017229 in words is "fifty-one billion, one hundred forty-five million, seventeen thousand, two hundred twenty-nine".