51070381 has 2 divisors, whose sum is σ = 51070382. Its totient is φ = 51070380.

The previous prime is 51070343. The next prime is 51070391. The reversal of 51070381 is 18307015.

51070381 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., 28355625 + 22714756 = 5325^2 + 4766^2 .

It is a cyclic number.

It is not a de Polignac number, because 51070381 - 2¹³ = 51062189 is a prime.

It is a super-2 number, since 2×51070381² = 5216367630970322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51070301) 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, 25535190 + 25535191.

It is an arithmetic number, because the mean of its divisors is an integer number (25535191).

Almost surely, 2^51070381 is an apocalyptic number.

It is an amenable number.

51070381 is a deficient number, since it is larger than the sum of its proper divisors (1).

51070381 is an equidigital number, since it uses as much as digits as its factorization.

51070381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 51070381 is about 7146.3543852793. The cubic root of 51070381 is about 371.0134887073.

Adding to 51070381 its reverse (18307015), we get a palindrome (69377396).

The spelling of 51070381 in words is "fifty-one million, seventy thousand, three hundred eighty-one".