1253521501 has 2 divisors, whose sum is σ = 1253521502. Its totient is φ = 1253521500.

The previous prime is 1253521499. The next prime is 1253521531. The reversal of 1253521501 is 1051253521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190319001 + 63202500 = 34501^2 + 7950^2 .

It is an emirp because it is prime and its reverse (1051253521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1253521501 - 2¹ = 1253521499 is a prime.

Together with 1253521499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253521531) 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, 626760750 + 626760751.

It is an arithmetic number, because the mean of its divisors is an integer number (626760751).

Almost surely, 2^1253521501 is an apocalyptic number.

It is an amenable number.

1253521501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253521501 is an equidigital number, since it uses as much as digits as its factorization.

1253521501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1253521501 is about 35405.1055781507. The cubic root of 1253521501 is about 1078.2279757481.

The spelling of 1253521501 in words is "one billion, two hundred fifty-three million, five hundred twenty-one thousand, five hundred one".