1210891 has 16 divisors (see below), whose sum is σ = 1410048. Its totient is φ = 1029600.

The previous prime is 1210883. The next prime is 1210897. The reversal of 1210891 is 1980121.

It is not a de Polignac number, because 1210891 - 2³ = 1210883 is a prime.

It is a Duffinian number.

1210891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1210897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18040 + ... + 18106.

It is an arithmetic number, because the mean of its divisors is an integer number (88128).

2^1210891 is an apocalyptic number.

1210891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1210891 is a deficient number, since it is larger than the sum of its proper divisors (199157).

1210891 is a wasteful number, since it uses less digits than its factorization.

1210891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

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

The square root of 1210891 is about 1100.4049254706. The cubic root of 1210891 is about 106.5863729505.

The spelling of 1210891 in words is "one million, two hundred ten thousand, eight hundred ninety-one".