51778137 has 16 divisors (see below), whose sum is σ = 71628480. Its totient is φ = 33230400.

The previous prime is 51778123. The next prime is 51778157. The reversal of 51778137 is 73187715.

It is not a de Polignac number, because 51778137 - 2¹⁶ = 51712601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51778095 and 51778104.

It is not an unprimeable number, because it can be changed into a prime (51778117) 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 15 ways as a sum of consecutive naturals, for example, 39462 + ... + 40752.

It is an arithmetic number, because the mean of its divisors is an integer number (4476780).

Almost surely, 2^51778137 is an apocalyptic number.

It is an amenable number.

51778137 is a deficient number, since it is larger than the sum of its proper divisors (19850343).

51778137 is a wasteful number, since it uses less digits than its factorization.

51778137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784.

The product of its digits is 41160, while the sum is 39.

The square root of 51778137 is about 7195.7026759032. The cubic root of 51778137 is about 372.7195216729.

It can be divided in two parts, 51778 and 137, that added together give a palindrome (51915).

The spelling of 51778137 in words is "fifty-one million, seven hundred seventy-eight thousand, one hundred thirty-seven".