51139349 has 4 divisors (see below), whose sum is σ = 54147564. Its totient is φ = 48131136.

The previous prime is 51139343. The next prime is 51139357. The reversal of 51139349 is 94393115.

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 25959025 + 25180324 = 5095^2 + 5018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51139349 is a prime.

It is a super-2 number, since 2×51139349² = 5230466032287602, 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 (51139343) 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 3 ways as a sum of consecutive naturals, for example, 1504082 + ... + 1504115.

It is an arithmetic number, because the mean of its divisors is an integer number (13536891).

Almost surely, 2^51139349 is an apocalyptic number.

It is an amenable number.

51139349 is a deficient number, since it is larger than the sum of its proper divisors (3008215).

51139349 is a wasteful number, since it uses less digits than its factorization.

51139349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008214.

The product of its digits is 14580, while the sum is 35.

The square root of 51139349 is about 7151.1781546819. The cubic root of 51139349 is about 371.1804253149.

The spelling of 51139349 in words is "fifty-one million, one hundred thirty-nine thousand, three hundred forty-nine".