1093720091 has 4 divisors (see below), whose sum is σ = 1108702632. Its totient is φ = 1078737552.

The previous prime is 1093720087. The next prime is 1093720097. The reversal of 1093720091 is 1900273901.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1093720091 - 2² = 1093720087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1093720097) 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, 7491161 + ... + 7491306.

It is an arithmetic number, because the mean of its divisors is an integer number (277175658).

Almost surely, 2^1093720091 is an apocalyptic number.

1093720091 is a deficient number, since it is larger than the sum of its proper divisors (14982541).

1093720091 is an equidigital number, since it uses as much as digits as its factorization.

1093720091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14982540.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 1093720091 is about 33071.4392036391. The cubic root of 1093720091 is about 1030.3119333601.

Adding to 1093720091 its reverse (1900273901), we get a palindrome (2993993992).

The spelling of 1093720091 in words is "one billion, ninety-three million, seven hundred twenty thousand, ninety-one".