245212133 has 2 divisors, whose sum is σ = 245212134. Its totient is φ = 245212132.

The previous prime is 245212127. The next prime is 245212141. The reversal of 245212133 is 331212542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226141444 + 19070689 = 15038^2 + 4367^2 .

It is a cyclic number.

It is not a de Polignac number, because 245212133 - 2¹⁶ = 245146597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_13431632 and since 245212133 and 13431632 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 245212099 and 245212108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245212333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122606066 + 122606067.

It is an arithmetic number, because the mean of its divisors is an integer number (122606067).

Almost surely, 2^245212133 is an apocalyptic number.

It is an amenable number.

245212133 is a deficient number, since it is larger than the sum of its proper divisors (1).

245212133 is an equidigital number, since it uses as much as digits as its factorization.

245212133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 245212133 is about 15659.2507164296. The cubic root of 245212133 is about 625.9130190777.

Adding to 245212133 its reverse (331212542), we get a palindrome (576424675).

The spelling of 245212133 in words is "two hundred forty-five million, two hundred twelve thousand, one hundred thirty-three".