7121231 has 4 divisors (see below), whose sum is σ = 7669032. Its totient is φ = 6573432.

The previous prime is 7121209. The next prime is 7121263. The reversal of 7121231 is 1321217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321217 = 47 ⋅28111.

It is a cyclic number.

It is not a de Polignac number, because 7121231 - 2¹⁸ = 6859087 is a prime.

It is a super-2 number, since 2×7121231² = 101423861910722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121731) 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, 273881 + ... + 273906.

It is an arithmetic number, because the mean of its divisors is an integer number (1917258).

Almost surely, 2^7121231 is an apocalyptic number.

7121231 is a deficient number, since it is larger than the sum of its proper divisors (547801).

7121231 is a wasteful number, since it uses less digits than its factorization.

7121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547800.

The product of its digits is 84, while the sum is 17.

The square root of 7121231 is about 2668.5634712332. The cubic root of 7121231 is about 192.3911207530.

Adding to 7121231 its reverse (1321217), we get a palindrome (8442448).

The spelling of 7121231 in words is "seven million, one hundred twenty-one thousand, two hundred thirty-one".