2545151221 has 2 divisors, whose sum is σ = 2545151222. Its totient is φ = 2545151220.

The previous prime is 2545151197. The next prime is 2545151233. The reversal of 2545151221 is 1221515452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2159460900 + 385690321 = 46470^2 + 19639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2545151221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2545151221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2545151291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272575610 + 1272575611.

It is an arithmetic number, because the mean of its divisors is an integer number (1272575611).

Almost surely, 2^2545151221 is an apocalyptic number.

It is an amenable number.

2545151221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545151221 is an equidigital number, since it uses as much as digits as its factorization.

2545151221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000, while the sum is 28.

The square root of 2545151221 is about 50449.4917813847. The cubic root of 2545151221 is about 1365.3307254993.

Adding to 2545151221 its reverse (1221515452), we get a palindrome (3766666673).

The spelling of 2545151221 in words is "two billion, five hundred forty-five million, one hundred fifty-one thousand, two hundred twenty-one".