1253336521 has 2 divisors, whose sum is σ = 1253336522. Its totient is φ = 1253336520.

The previous prime is 1253336473. The next prime is 1253336549. The reversal of 1253336521 is 1256333521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1066740921 + 186595600 = 32661^2 + 13660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253336521 - 2⁷ = 1253336393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1253336621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626668260 + 626668261.

It is an arithmetic number, because the mean of its divisors is an integer number (626668261).

Almost surely, 2^1253336521 is an apocalyptic number.

It is an amenable number.

1253336521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253336521 is an equidigital number, since it uses as much as digits as its factorization.

1253336521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 31.

The square root of 1253336521 is about 35402.4931466698. The cubic root of 1253336521 is about 1078.1749357264.

The spelling of 1253336521 in words is "one billion, two hundred fifty-three million, three hundred thirty-six thousand, five hundred twenty-one".