1191851 has 8 divisors (see below), whose sum is σ = 1266000. Its totient is φ = 1118880.

The previous prime is 1191847. The next prime is 1191899. The reversal of 1191851 is 1581911.

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

It is a cyclic number.

It is not a de Polignac number, because 1191851 - 2² = 1191847 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 1191851.

It is not an unprimeable number, because it can be changed into a prime (1191821) 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, 2621 + ... + 3041.

It is an arithmetic number, because the mean of its divisors is an integer number (158250).

2^1191851 is an apocalyptic number.

1191851 is a deficient number, since it is larger than the sum of its proper divisors (74149).

1191851 is a wasteful number, since it uses less digits than its factorization.

1191851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589.

The product of its digits is 360, while the sum is 26.

The square root of 1191851 is about 1091.7192862636. The cubic root of 1191851 is about 106.0247657809.

The spelling of 1191851 in words is "one million, one hundred ninety-one thousand, eight hundred fifty-one".