1161801806 has 32 divisors (see below), whose sum is σ = 1991091456. Its totient is φ = 503272000.

The previous prime is 1161801779. The next prime is 1161801833. The reversal of 1161801806 is 6081081611.

It is an interprime number because it is at equal distance from previous prime (1161801779) and next prime (1161801833).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138101 + ... + 146271.

It is an arithmetic number, because the mean of its divisors is an integer number (62221608).

Almost surely, 2^1161801806 is an apocalyptic number.

1161801806 is a deficient number, since it is larger than the sum of its proper divisors (829289650).

1161801806 is a wasteful number, since it uses less digits than its factorization.

1161801806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8488.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 1161801806 is about 34085.2138910701. The cubic root of 1161801806 is about 1051.2613129632.

The spelling of 1161801806 in words is "one billion, one hundred sixty-one million, eight hundred one thousand, eight hundred six".