1020000091 has 16 divisors (see below), whose sum is σ = 1150380000. Its totient is φ = 896313600.

The previous prime is 1020000061. The next prime is 1020000103. The reversal of 1020000091 is 1900000201.

It is a cyclic number.

It is not a de Polignac number, because 1020000091 - 2²⁷ = 885782363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020000011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38785 + ... + 59533.

It is an arithmetic number, because the mean of its divisors is an integer number (71898750).

Almost surely, 2^1020000091 is an apocalyptic number.

1020000091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1020000091 is a deficient number, since it is larger than the sum of its proper divisors (130379909).

1020000091 is a wasteful number, since it uses less digits than its factorization.

1020000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20910.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1020000091 is about 31937.4402700029. The cubic root of 1020000091 is about 1006.6227394956.

Adding to 1020000091 its reverse (1900000201), we get a palindrome (2920000292).

The spelling of 1020000091 in words is "one billion, twenty million, ninety-one", and thus it is an aban number and an uban number.