1191951 has 6 divisors (see below), whose sum is σ = 1721720. Its totient is φ = 794628.

The previous prime is 1191947. The next prime is 1191973. The reversal of 1191951 is 1591911.

It is not a de Polignac number, because 1191951 - 2² = 1191947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66211 + ... + 66228.

2^1191951 is an apocalyptic number.

1191951 is a deficient number, since it is larger than the sum of its proper divisors (529769).

1191951 is a wasteful number, since it uses less digits than its factorization.

1191951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132445 (or 132442 counting only the distinct ones).

The product of its digits is 405, while the sum is 27.

The square root of 1191951 is about 1091.7650846221. The cubic root of 1191951 is about 106.0277309670.

The spelling of 1191951 in words is "one million, one hundred ninety-one thousand, nine hundred fifty-one".