1261213 has 4 divisors (see below), whose sum is σ = 1335420. Its totient is φ = 1187008.

The previous prime is 1261199. The next prime is 1261217. The reversal of 1261213 is 3121621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3121621 = 103 ⋅30307.

It can be written as a sum of positive squares in 2 ways, for example, as 710649 + 550564 = 843^2 + 742^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1261213 is a prime.

It is a Duffinian number.

1261213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261217) 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, 37078 + ... + 37111.

It is an arithmetic number, because the mean of its divisors is an integer number (333855).

2^1261213 is an apocalyptic number.

It is an amenable number.

1261213 is a deficient number, since it is larger than the sum of its proper divisors (74207).

1261213 is an equidigital number, since it uses as much as digits as its factorization.

1261213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74206.

The product of its digits is 72, while the sum is 16.

The square root of 1261213 is about 1123.0373991992. The cubic root of 1261213 is about 108.0428784930.

Adding to 1261213 its reverse (3121621), we get a palindrome (4382834).

The spelling of 1261213 in words is "one million, two hundred sixty-one thousand, two hundred thirteen".