197499994791 has 16 divisors (see below), whose sum is σ = 288933264000. Its totient is φ = 119005073120.

The previous prime is 197499994771. The next prime is 197499994807.

197499994791 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 197499994791 - 2⁵ = 197499994759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197499994711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17291541 + ... + 17302958.

It is an arithmetic number, because the mean of its divisors is an integer number (18058329000).

Almost surely, 2^197499994791 is an apocalyptic number.

197499994791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197499994791 is a deficient number, since it is larger than the sum of its proper divisors (91433269209).

197499994791 is a wasteful number, since it uses less digits than its factorization.

197499994791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34594686.

The product of its digits is 416649744, while the sum is 78.

The spelling of 197499994791 in words is "one hundred ninety-seven billion, four hundred ninety-nine million, nine hundred ninety-four thousand, seven hundred ninety-one".