253721513 has 2 divisors, whose sum is σ = 253721514. Its totient is φ = 253721512.

The previous prime is 253721491. The next prime is 253721519. The reversal of 253721513 is 315127352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186923584 + 66797929 = 13672^2 + 8173^2 .

It is a cyclic number.

It is not a de Polignac number, because 253721513 - 2⁶ = 253721449 is a prime.

It is not a weakly prime, because it can be changed into another prime (253721519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126860756 + 126860757.

It is an arithmetic number, because the mean of its divisors is an integer number (126860757).

Almost surely, 2^253721513 is an apocalyptic number.

It is an amenable number.

253721513 is a deficient number, since it is larger than the sum of its proper divisors (1).

253721513 is an equidigital number, since it uses as much as digits as its factorization.

253721513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 29.

The square root of 253721513 is about 15928.6381401550. The cubic root of 253721513 is about 633.0710163596.

Adding to 253721513 its reverse (315127352), we get a palindrome (568848865).

The spelling of 253721513 in words is "two hundred fifty-three million, seven hundred twenty-one thousand, five hundred thirteen".