51203491 has 2 divisors, whose sum is σ = 51203492. Its totient is φ = 51203490.

The previous prime is 51203489. The next prime is 51203501. The reversal of 51203491 is 19430215.

51203491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51203491 - 2¹ = 51203489 is a prime.

Together with 51203489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51203431) 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, 25601745 + 25601746.

It is an arithmetic number, because the mean of its divisors is an integer number (25601746).

Almost surely, 2^51203491 is an apocalyptic number.

51203491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51203491 is an equidigital number, since it uses as much as digits as its factorization.

51203491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 51203491 is about 7155.6614648822. The cubic root of 51203491 is about 371.3355459694.

The spelling of 51203491 in words is "fifty-one million, two hundred three thousand, four hundred ninety-one".