51138377 has 2 divisors, whose sum is σ = 51138378. Its totient is φ = 51138376.

The previous prime is 51138349. The next prime is 51138391. The reversal of 51138377 is 77383115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50965321 + 173056 = 7139^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 51138377 - 2¹⁸ = 50876233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51138337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569188 + 25569189.

It is an arithmetic number, because the mean of its divisors is an integer number (25569189).

Almost surely, 2^51138377 is an apocalyptic number.

It is an amenable number.

51138377 is a deficient number, since it is larger than the sum of its proper divisors (1).

51138377 is an equidigital number, since it uses as much as digits as its factorization.

51138377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 35.

The square root of 51138377 is about 7151.1101935294. The cubic root of 51138377 is about 371.1780736381.

It can be divided in two parts, 51138 and 377, that added together give a palindrome (51515).

The spelling of 51138377 in words is "fifty-one million, one hundred thirty-eight thousand, three hundred seventy-seven".