51382533149 has 4 divisors (see below), whose sum is σ = 52224869820. Its totient is φ = 50540196480.

The previous prime is 51382533143. The next prime is 51382533173. The reversal of 51382533149 is 94133528315.

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 1377523225 + 50005009924 = 37115^2 + 223618^2 .

It is a cyclic number.

It is not a de Polignac number, because 51382533149 - 2⁸ = 51382532893 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 (51382533143) 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, 421168244 + ... + 421168365.

It is an arithmetic number, because the mean of its divisors is an integer number (13056217455).

Almost surely, 2^51382533149 is an apocalyptic number.

It is an amenable number.

51382533149 is a deficient number, since it is larger than the sum of its proper divisors (842336671).

51382533149 is an equidigital number, since it uses as much as digits as its factorization.

51382533149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842336670.

The product of its digits is 388800, while the sum is 44.

The spelling of 51382533149 in words is "fifty-one billion, three hundred eighty-two million, five hundred thirty-three thousand, one hundred forty-nine".