745121 has 6 divisors (see below), whose sum is σ = 807030. Its totient is φ = 687648.

The previous prime is 745117. The next prime is 745133. The reversal of 745121 is 121547.

It can be written as a sum of positive squares in 3 ways, for example, as 46225 + 698896 = 215^2 + 836^2 .

It is not a de Polignac number, because 745121 - 2² = 745117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 745093 and 745102.

It is not an unprimeable number, because it can be changed into a prime (745141) 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 5 ways as a sum of consecutive naturals, for example, 2036 + ... + 2373.

It is an arithmetic number, because the mean of its divisors is an integer number (134505).

2⁷⁴⁵¹²¹ is an apocalyptic number.

It is an amenable number.

745121 is a deficient number, since it is larger than the sum of its proper divisors (61909).

745121 is a wasteful number, since it uses less digits than its factorization.

745121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4435 (or 4422 counting only the distinct ones).

The product of its digits is 280, while the sum is 20.

The square root of 745121 is about 863.2039156538. The cubic root of 745121 is about 90.6585846194.

Adding to 745121 its reverse (121547), we get a palindrome (866668).

The spelling of 745121 in words is "seven hundred forty-five thousand, one hundred twenty-one".