51815377 has 2 divisors, whose sum is σ = 51815378. Its totient is φ = 51815376.

The previous prime is 51815333. The next prime is 51815381. The reversal of 51815377 is 77351815.

51815377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31348801 + 20466576 = 5599^2 + 4524^2 .

It is a cyclic number.

It is not a de Polignac number, because 51815377 - 2¹⁵ = 51782609 is a prime.

It is not a weakly prime, because it can be changed into another prime (51815317) 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 as a sum of consecutive naturals, namely, 25907688 + 25907689.

It is an arithmetic number, because the mean of its divisors is an integer number (25907689).

Almost surely, 2^51815377 is an apocalyptic number.

It is an amenable number.

51815377 is a deficient number, since it is larger than the sum of its proper divisors (1).

51815377 is an equidigital number, since it uses as much as digits as its factorization.

51815377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 37.

The square root of 51815377 is about 7198.2898663502. The cubic root of 51815377 is about 372.8088563451.

The spelling of 51815377 in words is "fifty-one million, eight hundred fifteen thousand, three hundred seventy-seven".