43313121 has 6 divisors (see below), whose sum is σ = 62563410. Its totient is φ = 28875408.

The previous prime is 43313113. The next prime is 43313129. The reversal of 43313121 is 12131334.

It is an interprime number because it is at equal distance from previous prime (43313113) and next prime (43313129).

It can be written as a sum of positive squares in only one way, i.e., 38750625 + 4562496 = 6225^2 + 2136^2 .

It is not a de Polignac number, because 43313121 - 2³ = 43313113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43313094 and 43313103.

It is not an unprimeable number, because it can be changed into a prime (43313129) 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, 2406276 + ... + 2406293.

It is an arithmetic number, because the mean of its divisors is an integer number (10427235).

Almost surely, 2^43313121 is an apocalyptic number.

It is an amenable number.

43313121 is a deficient number, since it is larger than the sum of its proper divisors (19250289).

43313121 is a wasteful number, since it uses less digits than its factorization.

43313121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4812575 (or 4812572 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 43313121 is about 6581.2704700536. The cubic root of 43313121 is about 351.1881281412.

Adding to 43313121 its reverse (12131334), we get a palindrome (55444455).

It can be divided in two parts, 43313 and 121, that added together give a palindrome (43434).

The spelling of 43313121 in words is "forty-three million, three hundred thirteen thousand, one hundred twenty-one".