1012991 has 8 divisors (see below), whose sum is σ = 1182720. Its totient is φ = 849528.

The previous prime is 1012981. The next prime is 1012993. The reversal of 1012991 is 1992101.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012993) 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, 1211 + ... + 1868.

It is an arithmetic number, because the mean of its divisors is an integer number (147840).

2^1012991 is an apocalyptic number.

1012991 is a deficient number, since it is larger than the sum of its proper divisors (169729).

1012991 is an equidigital number, since it uses as much as digits as its factorization.

1012991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1012991 is about 1006.4745401648. The cubic root of 1012991 is about 100.4311715721.

The spelling of 1012991 in words is "one million, twelve thousand, nine hundred ninety-one".