1021140091 has 2 divisors, whose sum is σ = 1021140092. Its totient is φ = 1021140090.

The previous prime is 1021140077. The next prime is 1021140143. The reversal of 1021140091 is 1900411201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021140091 - 2⁵ = 1021140059 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021140041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510570045 + 510570046.

It is an arithmetic number, because the mean of its divisors is an integer number (510570046).

Almost surely, 2^1021140091 is an apocalyptic number.

1021140091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021140091 is an equidigital number, since it uses as much as digits as its factorization.

1021140091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1021140091 is about 31955.2826775167. The cubic root of 1021140091 is about 1006.9976161516.

Adding to 1021140091 its reverse (1900411201), we get a palindrome (2921551292).

The spelling of 1021140091 in words is "one billion, twenty-one million, one hundred forty thousand, ninety-one".