747121 has 4 divisors (see below), whose sum is σ = 749044. Its totient is φ = 745200.

The previous prime is 747113. The next prime is 747139. The reversal of 747121 is 121747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121747 = 211 ⋅577.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 429025 = 564^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 747121 - 2³ = 747113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 747092 and 747101.

It is not an unprimeable number, because it can be changed into a prime (747161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (187261).

2⁷⁴⁷¹²¹ is an apocalyptic number.

It is an amenable number.

747121 is a deficient number, since it is larger than the sum of its proper divisors (1923).

747121 is a wasteful number, since it uses less digits than its factorization.

747121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922.

The product of its digits is 392, while the sum is 22.

The square root of 747121 is about 864.3616141407. The cubic root of 747121 is about 90.7396252309.

Adding to 747121 its reverse (121747), we get a palindrome (868868).

It can be divided in two parts, 747 and 121, that added together give a palindrome (868).

The spelling of 747121 in words is "seven hundred forty-seven thousand, one hundred twenty-one", and thus it is an iban number.