1253605401 has 6 divisors (see below), whose sum is σ = 1810763370. Its totient is φ = 835736928.

The previous prime is 1253605369. The next prime is 1253605439. The reversal of 1253605401 is 1045063521.

1253605401 is a `hidden beast` number, since 1 + 2 + 53 + 605 + 4 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 897302025 + 356303376 = 29955^2 + 18876^2 .

It is not a de Polignac number, because 1253605401 - 2⁵ = 1253605369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1253605471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69644736 + ... + 69644753.

It is an arithmetic number, because the mean of its divisors is an integer number (301793895).

Almost surely, 2^1253605401 is an apocalyptic number.

It is an amenable number.

1253605401 is a deficient number, since it is larger than the sum of its proper divisors (557157969).

1253605401 is a wasteful number, since it uses less digits than its factorization.

1253605401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139289495 (or 139289492 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1253605401 is about 35406.2904156874. The cubic root of 1253605401 is about 1078.2520309953.

Adding to 1253605401 its reverse (1045063521), we get a palindrome (2298668922).

The spelling of 1253605401 in words is "one billion, two hundred fifty-three million, six hundred five thousand, four hundred one".