51143381 has 2 divisors, whose sum is σ = 51143382. Its totient is φ = 51143380.

The previous prime is 51143363. The next prime is 51143387. The reversal of 51143381 is 18334115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48790225 + 2353156 = 6985^2 + 1534^2 .

It is a cyclic number.

It is not a de Polignac number, because 51143381 - 2¹⁴ = 51126997 is a prime.

It is a super-2 number, since 2×51143381² = 5231290840222322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51143381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51143387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25571690 + 25571691.

It is an arithmetic number, because the mean of its divisors is an integer number (25571691).

Almost surely, 2^51143381 is an apocalyptic number.

It is an amenable number.

51143381 is a deficient number, since it is larger than the sum of its proper divisors (1).

51143381 is an equidigital number, since it uses as much as digits as its factorization.

51143381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 51143381 is about 7151.4600607149. The cubic root of 51143381 is about 371.1901801004.

Adding to 51143381 its reverse (18334115), we get a palindrome (69477496).

The spelling of 51143381 in words is "fifty-one million, one hundred forty-three thousand, three hundred eighty-one".