1261191 has 4 divisors (see below), whose sum is σ = 1681592. Its totient is φ = 840792.

The previous prime is 1261177. The next prime is 1261199. The reversal of 1261191 is 1911621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1261191 - 2¹⁰ = 1260167 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210196 + ... + 210201.

It is an arithmetic number, because the mean of its divisors is an integer number (420398).

2^1261191 is an apocalyptic number.

1261191 is a deficient number, since it is larger than the sum of its proper divisors (420401).

1261191 is an equidigital number, since it uses as much as digits as its factorization.

1261191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420400.

The product of its digits is 108, while the sum is 21.

The square root of 1261191 is about 1123.0276042912. The cubic root of 1261191 is about 108.0422502731.

The spelling of 1261191 in words is "one million, two hundred sixty-one thousand, one hundred ninety-one".