20128962391 has 2 divisors, whose sum is σ = 20128962392. Its totient is φ = 20128962390.

The previous prime is 20128962367. The next prime is 20128962431. The reversal of 20128962391 is 19326982102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20128962391 - 2¹¹ = 20128960343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20128966391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064481195 + 10064481196.

It is an arithmetic number, because the mean of its divisors is an integer number (10064481196).

Almost surely, 2^20128962391 is an apocalyptic number.

20128962391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20128962391 is an equidigital number, since it uses as much as digits as its factorization.

20128962391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 20128962391 in words is "twenty billion, one hundred twenty-eight million, nine hundred sixty-two thousand, three hundred ninety-one".