253664549 has 2 divisors, whose sum is σ = 253664550. Its totient is φ = 253664548.

The previous prime is 253664501. The next prime is 253664591. The reversal of 253664549 is 945466352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251444449 + 2220100 = 15857^2 + 1490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253664549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253664249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126832274 + 126832275.

It is an arithmetic number, because the mean of its divisors is an integer number (126832275).

Almost surely, 2^253664549 is an apocalyptic number.

It is an amenable number.

253664549 is a deficient number, since it is larger than the sum of its proper divisors (1).

253664549 is an equidigital number, since it uses as much as digits as its factorization.

253664549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 44.

The square root of 253664549 is about 15926.8499396459. The cubic root of 253664549 is about 633.0236350712.

The spelling of 253664549 in words is "two hundred fifty-three million, six hundred sixty-four thousand, five hundred forty-nine".