1253019661 has 2 divisors, whose sum is σ = 1253019662. Its totient is φ = 1253019660.

The previous prime is 1253019653. The next prime is 1253019679. The reversal of 1253019661 is 1669103521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1238617636 + 14402025 = 35194^2 + 3795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253019661 - 2³ = 1253019653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253019161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626509830 + 626509831.

It is an arithmetic number, because the mean of its divisors is an integer number (626509831).

Almost surely, 2^1253019661 is an apocalyptic number.

It is an amenable number.

1253019661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253019661 is an equidigital number, since it uses as much as digits as its factorization.

1253019661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1253019661 is about 35398.0177552360. The cubic root of 1253019661 is about 1078.0840691214.

The spelling of 1253019661 in words is "one billion, two hundred fifty-three million, nineteen thousand, six hundred sixty-one".