1013121091 has 2 divisors, whose sum is σ = 1013121092. Its totient is φ = 1013121090.

The previous prime is 1013121079. The next prime is 1013121107. The reversal of 1013121091 is 1901213101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1013121091 - 2⁷ = 1013120963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1013121041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506560545 + 506560546.

It is an arithmetic number, because the mean of its divisors is an integer number (506560546).

Almost surely, 2^1013121091 is an apocalyptic number.

1013121091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013121091 is an equidigital number, since it uses as much as digits as its factorization.

1013121091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 1013121091 is about 31829.5631606844. The cubic root of 1013121091 is about 1004.3547060088.

Adding to 1013121091 its reverse (1901213101), we get a palindrome (2914334192).

The spelling of 1013121091 in words is "one billion, thirteen million, one hundred twenty-one thousand, ninety-one".