1205096991 has 8 divisors (see below), whose sum is σ = 1836338304. Its totient is φ = 688626840.

The previous prime is 1205096947. The next prime is 1205097011. The reversal of 1205096991 is 1996905021.

It is a happy number.

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

It is not a de Polignac number, because 1205096991 - 2⁶ = 1205096927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205096911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28692765 + ... + 28692806.

It is an arithmetic number, because the mean of its divisors is an integer number (229542288).

Almost surely, 2^1205096991 is an apocalyptic number.

1205096991 is a deficient number, since it is larger than the sum of its proper divisors (631241313).

1205096991 is an equidigital number, since it uses as much as digits as its factorization.

1205096991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57385581.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 1205096991 is about 34714.5069243393. The cubic root of 1205096991 is about 1064.1609887817.

The spelling of 1205096991 in words is "one billion, two hundred five million, ninety-six thousand, nine hundred ninety-one".