1011939091 has 4 divisors (see below), whose sum is σ = 1012076800. Its totient is φ = 1011801384.

The previous prime is 1011939029. The next prime is 1011939109. The reversal of 1011939091 is 1909391101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1909391101 = 17977 ⋅106213.

It is a cyclic number.

It is not a de Polignac number, because 1011939091 - 2¹⁵ = 1011906323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011939191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57171 + ... + 72748.

It is an arithmetic number, because the mean of its divisors is an integer number (253019200).

Almost surely, 2^1011939091 is an apocalyptic number.

1011939091 is a deficient number, since it is larger than the sum of its proper divisors (137709).

1011939091 is an equidigital number, since it uses as much as digits as its factorization.

1011939091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137708.

The product of its (nonzero) digits is 2187, while the sum is 34.

The square root of 1011939091 is about 31810.9900977634. The cubic root of 1011939091 is about 1003.9639632336.

The spelling of 1011939091 in words is "one billion, eleven million, nine hundred thirty-nine thousand, ninety-one".