1161785901 has 8 divisors (see below), whose sum is σ = 1551292384. Its totient is φ = 773401680.

The previous prime is 1161785897. The next prime is 1161785939. The reversal of 1161785901 is 1095871611.

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

It is not a de Polignac number, because 1161785901 - 2² = 1161785897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161785901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161785941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278146 + ... + 282291.

It is an arithmetic number, because the mean of its divisors is an integer number (193911548).

Almost surely, 2^1161785901 is an apocalyptic number.

It is an amenable number.

1161785901 is a deficient number, since it is larger than the sum of its proper divisors (389506483).

1161785901 is an equidigital number, since it uses as much as digits as its factorization.

1161785901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561131.

The product of its (nonzero) digits is 15120, while the sum is 39.

The square root of 1161785901 is about 34084.9805779613. The cubic root of 1161785901 is about 1051.2565157056.

The spelling of 1161785901 in words is "one billion, one hundred sixty-one million, seven hundred eighty-five thousand, nine hundred one".