51965977 has 4 divisors (see below), whose sum is σ = 59389696. Its totient is φ = 44542260.

The previous prime is 51965971. The next prime is 51965981. The reversal of 51965977 is 77956915.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77956915 = 5 ⋅15591383.

It is not a de Polignac number, because 51965977 - 2¹¹ = 51963929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51965977.

It is not an unprimeable number, because it can be changed into a prime (51965971) 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, 3711849 + ... + 3711862.

It is an arithmetic number, because the mean of its divisors is an integer number (14847424).

Almost surely, 2^51965977 is an apocalyptic number.

It is an amenable number.

51965977 is a deficient number, since it is larger than the sum of its proper divisors (7423719).

51965977 is an equidigital number, since it uses as much as digits as its factorization.

51965977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7423718.

The product of its digits is 595350, while the sum is 49.

The square root of 51965977 is about 7208.7430943265. The cubic root of 51965977 is about 373.1696932885.

The spelling of 51965977 in words is "fifty-one million, nine hundred sixty-five thousand, nine hundred seventy-seven".