197491963 has 2 divisors, whose sum is σ = 197491964. Its totient is φ = 197491962.

The previous prime is 197491919. The next prime is 197491993. The reversal of 197491963 is 369194791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197491963 - 2²⁵ = 163937531 is a prime.

It is not a weakly prime, because it can be changed into another prime (197491913) 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 as a sum of consecutive naturals, namely, 98745981 + 98745982.

It is an arithmetic number, because the mean of its divisors is an integer number (98745982).

Almost surely, 2^197491963 is an apocalyptic number.

197491963 is a deficient number, since it is larger than the sum of its proper divisors (1).

197491963 is an equidigital number, since it uses as much as digits as its factorization.

197491963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 197491963 is about 14053.1833760184. The cubic root of 197491963 is about 582.3487427389.

It can be divided in two parts, 19749 and 1963, that added together give a palindrome (21712).

The spelling of 197491963 in words is "one hundred ninety-seven million, four hundred ninety-one thousand, nine hundred sixty-three".