20532451391 has 2 divisors, whose sum is σ = 20532451392. Its totient is φ = 20532451390.

The previous prime is 20532451351. The next prime is 20532451451. The reversal of 20532451391 is 19315423502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20532451391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20532451351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266225695 + 10266225696.

It is an arithmetic number, because the mean of its divisors is an integer number (10266225696).

Almost surely, 2^20532451391 is an apocalyptic number.

20532451391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20532451391 is an equidigital number, since it uses as much as digits as its factorization.

20532451391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 20532451391 its reverse (19315423502), we get a palindrome (39847874893).

The spelling of 20532451391 in words is "twenty billion, five hundred thirty-two million, four hundred fifty-one thousand, three hundred ninety-one".