197156447 has 2 divisors, whose sum is σ = 197156448. Its totient is φ = 197156446.

The previous prime is 197156431. The next prime is 197156459. The reversal of 197156447 is 744651791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197156447 - 2⁴ = 197156431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197156398 and 197156407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197156467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98578223 + 98578224.

It is an arithmetic number, because the mean of its divisors is an integer number (98578224).

Almost surely, 2^197156447 is an apocalyptic number.

197156447 is a deficient number, since it is larger than the sum of its proper divisors (1).

197156447 is an equidigital number, since it uses as much as digits as its factorization.

197156447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 197156447 is about 14041.2409351880. The cubic root of 197156447 is about 582.0187747591.

It can be divided in two parts, 19715 and 6447, that added together give a palindrome (26162).

The spelling of 197156447 in words is "one hundred ninety-seven million, one hundred fifty-six thousand, four hundred forty-seven".