1253536161 has 4 divisors (see below), whose sum is σ = 1671381552. Its totient is φ = 835690772.

The previous prime is 1253536147. The next prime is 1253536171. The reversal of 1253536161 is 1616353521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1616353521 = 3 ⋅538784507.

It is a cyclic number.

It is not a de Polignac number, because 1253536161 - 2⁷ = 1253536033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1253536171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208922691 + ... + 208922696.

It is an arithmetic number, because the mean of its divisors is an integer number (417845388).

Almost surely, 2^1253536161 is an apocalyptic number.

It is an amenable number.

1253536161 is a deficient number, since it is larger than the sum of its proper divisors (417845391).

1253536161 is an equidigital number, since it uses as much as digits as its factorization.

1253536161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417845390.

The product of its digits is 16200, while the sum is 33.

The square root of 1253536161 is about 35405.3126098330. The cubic root of 1253536161 is about 1078.2321790427.

Adding to 1253536161 its reverse (1616353521), we get a palindrome (2869889682).

The spelling of 1253536161 in words is "one billion, two hundred fifty-three million, five hundred thirty-six thousand, one hundred sixty-one".