1238802561 has 12 divisors (see below), whose sum is σ = 1789690240. Its totient is φ = 825725880.

The previous prime is 1238802557. The next prime is 1238802569. The reversal of 1238802561 is 1652088321.

It is a happy number.

1238802561 is a `hidden beast` number, since 12 + 3 + 8 + 80 + 2 + 561 = 666.

It is not a de Polignac number, because 1238802561 - 2² = 1238802557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1238802569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83496 + ... + 97206.

Almost surely, 2^1238802561 is an apocalyptic number.

It is an amenable number.

1238802561 is a deficient number, since it is larger than the sum of its proper divisors (550887679).

1238802561 is a wasteful number, since it uses less digits than its factorization.

1238802561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23756 (or 23753 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1238802561 is about 35196.6271253369. The cubic root of 1238802561 is about 1073.9911388843.

The spelling of 1238802561 in words is "one billion, two hundred thirty-eight million, eight hundred two thousand, five hundred sixty-one".