253665197 has 4 divisors (see below), whose sum is σ = 254491776. Its totient is φ = 252838620.

The previous prime is 253665187. The next prime is 253665239. The reversal of 253665197 is 791566352.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253665197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253665107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412829 + ... + 413442.

It is an arithmetic number, because the mean of its divisors is an integer number (63622944).

Almost surely, 2^253665197 is an apocalyptic number.

It is an amenable number.

253665197 is a deficient number, since it is larger than the sum of its proper divisors (826579).

253665197 is an equidigital number, since it uses as much as digits as its factorization.

253665197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826578.

The product of its digits is 340200, while the sum is 44.

The square root of 253665197 is about 15926.8702826387. The cubic root of 253665197 is about 633.0241741020.

The spelling of 253665197 in words is "two hundred fifty-three million, six hundred sixty-five thousand, one hundred ninety-seven".