1213143 has 4 divisors (see below), whose sum is σ = 1617528. Its totient is φ = 808760.

The previous prime is 1213141. The next prime is 1213151. The reversal of 1213143 is 3413121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3413121 = 3 ⋅1137707.

It is a cyclic number.

It is not a de Polignac number, because 1213143 - 2¹ = 1213141 is a prime.

It is a D-number.

1213143 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202188 + ... + 202193.

It is an arithmetic number, because the mean of its divisors is an integer number (404382).

2^1213143 is an apocalyptic number.

1213143 is a deficient number, since it is larger than the sum of its proper divisors (404385).

1213143 is an equidigital number, since it uses as much as digits as its factorization.

1213143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404384.

The product of its digits is 72, while the sum is 15.

The square root of 1213143 is about 1101.4277098385. The cubic root of 1213143 is about 106.6524080333.

Adding to 1213143 its reverse (3413121), we get a palindrome (4626264).

The spelling of 1213143 in words is "one million, two hundred thirteen thousand, one hundred forty-three".