245136321 has 16 divisors (see below), whose sum is σ = 363406720. Its totient is φ = 163315440.

The previous prime is 245136319. The next prime is 245136341. The reversal of 245136321 is 123631542.

245136321 is a `hidden beast` number, since 24 + 5 + 1 + 3 + 632 + 1 = 666.

It is not a de Polignac number, because 245136321 - 2¹ = 245136319 is a prime.

It is a super-4 number, since 4×245136321⁴ (a number of 35 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245136341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73731 + ... + 76983.

It is an arithmetic number, because the mean of its divisors is an integer number (22712920).

Almost surely, 2^245136321 is an apocalyptic number.

It is an amenable number.

245136321 is a deficient number, since it is larger than the sum of its proper divisors (118270399).

245136321 is a wasteful number, since it uses less digits than its factorization.

245136321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6053 (or 6047 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 245136321 is about 15656.8298515376. The cubic root of 245136321 is about 625.8485081197.

Adding to 245136321 its reverse (123631542), we get a palindrome (368767863).

The spelling of 245136321 in words is "two hundred forty-five million, one hundred thirty-six thousand, three hundred twenty-one".