1210861 has 4 divisors (see below), whose sum is σ = 1236672. Its totient is φ = 1185052.

The previous prime is 1210843. The next prime is 1210871. The reversal of 1210861 is 1680121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1210861 - 2¹¹ = 1208813 is a prime.

It is a super-2 number, since 2×1210861² = 2932368722642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210801) 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 3 ways as a sum of consecutive naturals, for example, 12835 + ... + 12928.

It is an arithmetic number, because the mean of its divisors is an integer number (309168).

2^1210861 is an apocalyptic number.

It is an amenable number.

1210861 is a deficient number, since it is larger than the sum of its proper divisors (25811).

1210861 is an equidigital number, since it uses as much as digits as its factorization.

1210861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25810.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1210861 is about 1100.3912940404. The cubic root of 1210861 is about 106.5854927123.

Adding to 1210861 its reverse (1680121), we get a palindrome (2890982).

The spelling of 1210861 in words is "one million, two hundred ten thousand, eight hundred sixty-one".