51348739 has 4 divisors (see below), whose sum is σ = 55298656. Its totient is φ = 47398824.

The previous prime is 51348727. The next prime is 51348743. The reversal of 51348739 is 93784315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93784315 = 5 ⋅18756863.

It is a cyclic number.

It is not a de Polignac number, because 51348739 - 2¹⁷ = 51217667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51348709) 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, 1974939 + ... + 1974964.

It is an arithmetic number, because the mean of its divisors is an integer number (13824664).

Almost surely, 2^51348739 is an apocalyptic number.

51348739 is a deficient number, since it is larger than the sum of its proper divisors (3949917).

51348739 is a wasteful number, since it uses less digits than its factorization.

51348739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3949916.

The product of its digits is 90720, while the sum is 40.

The square root of 51348739 is about 7165.8034441366. The cubic root of 51348739 is about 371.6863347212.

The spelling of 51348739 in words is "fifty-one million, three hundred forty-eight thousand, seven hundred thirty-nine".