51388149 has 4 divisors (see below), whose sum is σ = 68517536. Its totient is φ = 34258764.

The previous prime is 51388147. The next prime is 51388151. The reversal of 51388149 is 94188315.

51388149 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51388147) and next prime (51388151).

It is not a de Polignac number, because 51388149 - 2¹ = 51388147 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 (51388147) 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, 8564689 + ... + 8564694.

It is an arithmetic number, because the mean of its divisors is an integer number (17129384).

Almost surely, 2^51388149 is an apocalyptic number.

It is an amenable number.

51388149 is a deficient number, since it is larger than the sum of its proper divisors (17129387).

51388149 is a wasteful number, since it uses less digits than its factorization.

51388149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17129386.

The product of its digits is 34560, while the sum is 39.

The square root of 51388149 is about 7168.5527828147. The cubic root of 51388149 is about 371.7813997794.

The spelling of 51388149 in words is "fifty-one million, three hundred eighty-eight thousand, one hundred forty-nine".