20150408891 has 2 divisors, whose sum is σ = 20150408892. Its totient is φ = 20150408890.

The previous prime is 20150408869. The next prime is 20150408909. The reversal of 20150408891 is 19880405102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20150408891 - 2¹⁸ = 20150146747 is a prime.

It is not a weakly prime, because it can be changed into another prime (20150408851) 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, 10075204445 + 10075204446.

It is an arithmetic number, because the mean of its divisors is an integer number (10075204446).

Almost surely, 2^20150408891 is an apocalyptic number.

20150408891 is a deficient number, since it is larger than the sum of its proper divisors (1).

20150408891 is an equidigital number, since it uses as much as digits as its factorization.

20150408891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 20150408891 in words is "twenty billion, one hundred fifty million, four hundred eight thousand, eight hundred ninety-one".