1091951 has 8 divisors (see below), whose sum is σ = 1274880. Its totient is φ = 915768.

The previous prime is 1091939. The next prime is 1091957. The reversal of 1091951 is 1591901.

It is a happy number.

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

It is not a de Polignac number, because 1091951 - 2⁶ = 1091887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1091951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1331 + ... + 1988.

It is an arithmetic number, because the mean of its divisors is an integer number (159360).

2^1091951 is an apocalyptic number.

1091951 is a deficient number, since it is larger than the sum of its proper divisors (182929).

1091951 is an equidigital number, since it uses as much as digits as its factorization.

1091951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 1091951 is about 1044.9645927016. The cubic root of 1091951 is about 102.9756124120.

The spelling of 1091951 in words is "one million, ninety-one thousand, nine hundred fifty-one".