51139133 has 4 divisors (see below), whose sum is σ = 51713820. Its totient is φ = 50564448.

The previous prime is 51139091. The next prime is 51139141. The reversal of 51139133 is 33193115.

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 21141604 + 29997529 = 4598^2 + 5477^2 .

It is a cyclic number.

It is not a de Polignac number, because 51139133 - 2⁸ = 51138877 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 (51130133) 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, 287210 + ... + 287387.

It is an arithmetic number, because the mean of its divisors is an integer number (12928455).

Almost surely, 2^51139133 is an apocalyptic number.

It is an amenable number.

51139133 is a deficient number, since it is larger than the sum of its proper divisors (574687).

51139133 is an equidigital number, since it uses as much as digits as its factorization.

51139133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574686.

The product of its digits is 1215, while the sum is 26.

The square root of 51139133 is about 7151.1630522594. The cubic root of 51139133 is about 371.1799027226.

The spelling of 51139133 in words is "fifty-one million, one hundred thirty-nine thousand, one hundred thirty-three".