51915749 has 4 divisors (see below), whose sum is σ = 53123136. Its totient is φ = 50708364.

The previous prime is 51915709. The next prime is 51915751. The reversal of 51915749 is 94751915.

51915749 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 a cyclic number.

It is not a de Polignac number, because 51915749 - 2¹⁶ = 51850213 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 (51915709) 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, 603629 + ... + 603714.

It is an arithmetic number, because the mean of its divisors is an integer number (13280784).

Almost surely, 2^51915749 is an apocalyptic number.

It is an amenable number.

51915749 is a deficient number, since it is larger than the sum of its proper divisors (1207387).

51915749 is a wasteful number, since it uses less digits than its factorization.

51915749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207386.

The product of its digits is 56700, while the sum is 41.

The square root of 51915749 is about 7205.2584270101. The cubic root of 51915749 is about 373.0494247937.

The spelling of 51915749 in words is "fifty-one million, nine hundred fifteen thousand, seven hundred forty-nine".