51143431 has 2 divisors, whose sum is σ = 51143432. Its totient is φ = 51143430.

The previous prime is 51143423. The next prime is 51143447. The reversal of 51143431 is 13434115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51143431 - 2³ = 51143423 is a prime.

It is a super-2 number, since 2×51143431² = 5231301068903522, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51149431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25571715 + 25571716.

It is an arithmetic number, because the mean of its divisors is an integer number (25571716).

Almost surely, 2^51143431 is an apocalyptic number.

51143431 is a deficient number, since it is larger than the sum of its proper divisors (1).

51143431 is an equidigital number, since it uses as much as digits as its factorization.

51143431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 51143431 is about 7151.4635565037. The cubic root of 51143431 is about 371.1903010643.

Adding to 51143431 its reverse (13434115), we get a palindrome (64577546).

The spelling of 51143431 in words is "fifty-one million, one hundred forty-three thousand, four hundred thirty-one".