197578253 has 4 divisors (see below), whose sum is σ = 197822688. Its totient is φ = 197333820.

The previous prime is 197578237. The next prime is 197578279. The reversal of 197578253 is 352875791.

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: 352875791 = 977 ⋅361183.

It is a cyclic number.

It is not a de Polignac number, because 197578253 - 2⁴ = 197578237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 197578198 and 197578207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197508253) 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, 121001 + ... + 122622.

It is an arithmetic number, because the mean of its divisors is an integer number (49455672).

Almost surely, 2^197578253 is an apocalyptic number.

It is an amenable number.

197578253 is a deficient number, since it is larger than the sum of its proper divisors (244435).

197578253 is an equidigital number, since it uses as much as digits as its factorization.

197578253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244434.

The product of its digits is 529200, while the sum is 47.

The square root of 197578253 is about 14056.2531636279. The cubic root of 197578253 is about 582.4335454406.

The spelling of 197578253 in words is "one hundred ninety-seven million, five hundred seventy-eight thousand, two hundred fifty-three".