1211901 has 8 divisors (see below), whose sum is σ = 1620960. Its totient is φ = 805392.

The previous prime is 1211897. The next prime is 1211911. The reversal of 1211901 is 1091121.

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

It is not a de Polignac number, because 1211901 - 2² = 1211897 is a prime.

It is a Curzon number.

1211901 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211911) 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, 1510 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (202620).

2^1211901 is an apocalyptic number.

It is an amenable number.

1211901 is a deficient number, since it is larger than the sum of its proper divisors (409059).

1211901 is an equidigital number, since it uses as much as digits as its factorization.

1211901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275.

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 1211901 is about 1100.8637517877. The cubic root of 1211901 is about 106.6159991568.

It can be divided in two parts, 1211 and 901, that added together give a palindrome (2112).

The spelling of 1211901 in words is "one million, two hundred eleven thousand, nine hundred one".