197312913 has 12 divisors (see below), whose sum is σ = 325723008. Its totient is φ = 112750200.

The previous prime is 197312881. The next prime is 197312963. The reversal of 197312913 is 319213791.

It is a happy number.

It is not a de Polignac number, because 197312913 - 2⁵ = 197312881 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197312963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1565913 + ... + 1566038.

It is an arithmetic number, because the mean of its divisors is an integer number (27143584).

Almost surely, 2^197312913 is an apocalyptic number.

It is an amenable number.

197312913 is a deficient number, since it is larger than the sum of its proper divisors (128410095).

197312913 is a wasteful number, since it uses less digits than its factorization.

197312913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3131964 (or 3131961 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 197312913 is about 14046.8114887330. The cubic root of 197312913 is about 582.1727000152.

The spelling of 197312913 in words is "one hundred ninety-seven million, three hundred twelve thousand, nine hundred thirteen".