253128101 has 4 divisors (see below), whose sum is σ = 257277804. Its totient is φ = 248978400.

The previous prime is 253128097. The next prime is 253128103. The reversal of 253128101 is 101821352.

It is a happy number.

It is a Cunningham number, because it is equal to 15910²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8236900 + 244891201 = 2870^2 + 15649^2 .

It is a cyclic number.

It is not a de Polignac number, because 253128101 - 2² = 253128097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253128103) 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, 2074760 + ... + 2074881.

It is an arithmetic number, because the mean of its divisors is an integer number (64319451).

Almost surely, 2^253128101 is an apocalyptic number.

It is an amenable number.

253128101 is a deficient number, since it is larger than the sum of its proper divisors (4149703).

253128101 is an equidigital number, since it uses as much as digits as its factorization.

253128101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4149702.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 253128101 is about 15910.0000314268. Note that the first 4 decimals coincide. The cubic root of 253128101 is about 632.5770821605.

Adding to 253128101 its reverse (101821352), we get a palindrome (354949453).

The spelling of 253128101 in words is "two hundred fifty-three million, one hundred twenty-eight thousand, one hundred one".