51287377 has 2 divisors, whose sum is σ = 51287378. Its totient is φ = 51287376.

The previous prime is 51287371. The next prime is 51287429. The reversal of 51287377 is 77378215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 12362256 = 6239^2 + 3516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51287377 is a prime.

It is not a weakly prime, because it can be changed into another prime (51287371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25643688 + 25643689.

It is an arithmetic number, because the mean of its divisors is an integer number (25643689).

Almost surely, 2^51287377 is an apocalyptic number.

It is an amenable number.

51287377 is a deficient number, since it is larger than the sum of its proper divisors (1).

51287377 is an equidigital number, since it uses as much as digits as its factorization.

51287377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 40.

The square root of 51287377 is about 7161.5205787598. The cubic root of 51287377 is about 371.5382200298.

The spelling of 51287377 in words is "fifty-one million, two hundred eighty-seven thousand, three hundred seventy-seven".