253621001 has 8 divisors (see below), whose sum is σ = 256019400. Its totient is φ = 251233920.

The previous prime is 253620967. The next prime is 253621007. The reversal of 253621001 is 100126352.

It can be written as a sum of positive squares in 4 ways, for example, as 3222025 + 250398976 = 1795^2 + 15824^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253621001 - 2¹⁸ = 253358857 is a prime.

It is a super-2 number, since 2×253621001² = 128647224296484002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253621007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46085 + ... + 51293.

It is an arithmetic number, because the mean of its divisors is an integer number (32002425).

Almost surely, 2^253621001 is an apocalyptic number.

It is an amenable number.

253621001 is a deficient number, since it is larger than the sum of its proper divisors (2398399).

253621001 is a wasteful number, since it uses less digits than its factorization.

253621001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5659.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 253621001 is about 15925.4827556341. The cubic root of 253621001 is about 632.9874081053.

Adding to 253621001 its reverse (100126352), we get a palindrome (353747353).

The spelling of 253621001 in words is "two hundred fifty-three million, six hundred twenty-one thousand, one".