1012891 has 8 divisors (see below), whose sum is σ = 1115568. Its totient is φ = 919600.

The previous prime is 1012861. The next prime is 1012903. The reversal of 1012891 is 1982101.

It is not a de Polignac number, because 1012891 - 2⁷ = 1012763 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1012811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 951 + ... + 1711.

It is an arithmetic number, because the mean of its divisors is an integer number (139446).

2^1012891 is an apocalyptic number.

1012891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1012891 is a deficient number, since it is larger than the sum of its proper divisors (102677).

1012891 is an frugal number, since it uses more digits than its factorization.

1012891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1012891 is about 1006.4248605832. The cubic root of 1012891 is about 100.4278666900.

Adding to 1012891 its reverse (1982101), we get a palindrome (2994992).

It can be divided in two parts, 101 and 2891, that added together give a palindrome (2992).

The spelling of 1012891 in words is "one million, twelve thousand, eight hundred ninety-one".