1991126 has 8 divisors (see below), whose sum is σ = 2992680. Its totient is φ = 993568.

The previous prime is 1991123. The next prime is 1991131. The reversal of 1991126 is 6211991.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991123) 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, 1445 + ... + 2463.

It is an arithmetic number, because the mean of its divisors is an integer number (374085).

2^1991126 is an apocalyptic number.

1991126 is a deficient number, since it is larger than the sum of its proper divisors (1001554).

1991126 is a wasteful number, since it uses less digits than its factorization.

1991126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998.

The product of its digits is 972, while the sum is 29.

The square root of 1991126 is about 1411.0726416454. The cubic root of 1991126 is about 125.8054863845.

The spelling of 1991126 in words is "one million, nine hundred ninety-one thousand, one hundred twenty-six".