901981111 has 2 divisors, whose sum is σ = 901981112. Its totient is φ = 901981110.

The previous prime is 901981103. The next prime is 901981127. The reversal of 901981111 is 111189109.

It is a weak prime.

It is an emirp because it is prime and its reverse (111189109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 901981111 - 2³ = 901981103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (901981711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450990555 + 450990556.

It is an arithmetic number, because the mean of its divisors is an integer number (450990556).

Almost surely, 2^901981111 is an apocalyptic number.

901981111 is a deficient number, since it is larger than the sum of its proper divisors (1).

901981111 is an equidigital number, since it uses as much as digits as its factorization.

901981111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 31.

The square root of 901981111 is about 30033.0003662638. Note that the first 3 decimals coincide. The cubic root of 901981111 is about 966.1972882685.

The spelling of 901981111 in words is "nine hundred one million, nine hundred eighty-one thousand, one hundred eleven".