53151221 has 2 divisors, whose sum is σ = 53151222. Its totient is φ = 53151220.

The previous prime is 53151199. The next prime is 53151233. The reversal of 53151221 is 12215135.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 13322500 = 6311^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 53151221 - 2⁶ = 53151157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 53151193 and 53151202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53151281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26575610 + 26575611.

It is an arithmetic number, because the mean of its divisors is an integer number (26575611).

Almost surely, 2^53151221 is an apocalyptic number.

It is an amenable number.

53151221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53151221 is an equidigital number, since it uses as much as digits as its factorization.

53151221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 20.

The square root of 53151221 is about 7290.4883924193. The cubic root of 53151221 is about 375.9854873114.

Adding to 53151221 its reverse (12215135), we get a palindrome (65366356).

The spelling of 53151221 in words is "fifty-three million, one hundred fifty-one thousand, two hundred twenty-one".