1213101 has 6 divisors (see below), whose sum is σ = 1752270. Its totient is φ = 808728.

The previous prime is 1213097. The next prime is 1213109. The reversal of 1213101 is 1013121.

It can be written as a sum of positive squares in only one way, i.e., 1212201 + 900 = 1101^2 + 30^2 .

It is not a de Polignac number, because 1213101 - 2² = 1213097 is a prime.

It is a super-2 number, since 2×1213101² = 2943228072402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 134789 = 1213101 / (1 + 2 + 1 + 3 + 1 + 0 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67386 + ... + 67403.

It is an arithmetic number, because the mean of its divisors is an integer number (292045).

2^1213101 is an apocalyptic number.

It is an amenable number.

1213101 is a deficient number, since it is larger than the sum of its proper divisors (539169).

1213101 is a wasteful number, since it uses less digits than its factorization.

1213101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134795 (or 134792 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1213101 is about 1101.4086435107. The cubic root of 1213101 is about 106.6511772213.

Adding to 1213101 its reverse (1013121), we get a palindrome (2226222).

The spelling of 1213101 in words is "one million, two hundred thirteen thousand, one hundred one".