1026640111 has 6 divisors (see below), whose sum is σ = 1194254880. Its totient is φ = 879977196.

The previous prime is 1026640103. The next prime is 1026640117. The reversal of 1026640111 is 1110466201.

It is not a de Polignac number, because 1026640111 - 2³ = 1026640103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026640117) 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 in 5 ways as a sum of consecutive naturals, for example, 10475871 + ... + 10475968.

It is an arithmetic number, because the mean of its divisors is an integer number (199042480).

Almost surely, 2^1026640111 is an apocalyptic number.

1026640111 is a deficient number, since it is larger than the sum of its proper divisors (167614769).

1026640111 is an equidigital number, since it uses as much as digits as its factorization.

1026640111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20951853 (or 20951846 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1026640111 is about 32041.2251794466. The cubic root of 1026640111 is about 1008.8023286722.

The spelling of 1026640111 in words is "one billion, twenty-six million, six hundred forty thousand, one hundred eleven".