1231790091 has 8 divisors (see below), whose sum is σ = 1877013504. Its totient is φ = 703880040.

The previous prime is 1231790069. The next prime is 1231790117. The reversal of 1231790091 is 1900971321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231790091 - 2⁵ = 1231790059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231790011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29328315 + ... + 29328356.

It is an arithmetic number, because the mean of its divisors is an integer number (234626688).

Almost surely, 2^1231790091 is an apocalyptic number.

1231790091 is a deficient number, since it is larger than the sum of its proper divisors (645223413).

1231790091 is an equidigital number, since it uses as much as digits as its factorization.

1231790091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58656681.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 1231790091 is about 35096.8672533604. The cubic root of 1231790091 is about 1071.9607948066.

The spelling of 1231790091 in words is "one billion, two hundred thirty-one million, seven hundred ninety thousand, ninety-one".