245631121 has 4 divisors (see below), whose sum is σ = 245665332. Its totient is φ = 245596912.

The previous prime is 245631083. The next prime is 245631137. The reversal of 245631121 is 121136542.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 111534721 + 134096400 = 10561^2 + 11580^2 .

It is a cyclic number.

It is not a de Polignac number, because 245631121 - 2¹⁷ = 245500049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245631161) 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, 1726 + ... + 22231.

It is an arithmetic number, because the mean of its divisors is an integer number (61416333).

Almost surely, 2^245631121 is an apocalyptic number.

It is an amenable number.

245631121 is a deficient number, since it is larger than the sum of its proper divisors (34211).

245631121 is a wasteful number, since it uses less digits than its factorization.

245631121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34210.

The product of its digits is 1440, while the sum is 25.

The square root of 245631121 is about 15672.6232966916. The cubic root of 245631121 is about 626.2693103369.

Adding to 245631121 its reverse (121136542), we get a palindrome (366767663).

The spelling of 245631121 in words is "two hundred forty-five million, six hundred thirty-one thousand, one hundred twenty-one".