196613991 has 12 divisors (see below), whose sum is σ = 324569232. Its totient is φ = 112350816.

The previous prime is 196613987. The next prime is 196613999. The reversal of 196613991 is 199316691.

It is not a de Polignac number, because 196613991 - 2² = 196613987 is a prime.

It is a super-2 number, since 2×196613991² = 77314122913896162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196613999) 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, 1560366 + ... + 1560491.

It is an arithmetic number, because the mean of its divisors is an integer number (27047436).

Almost surely, 2^196613991 is an apocalyptic number.

196613991 is a deficient number, since it is larger than the sum of its proper divisors (127955241).

196613991 is a wasteful number, since it uses less digits than its factorization.

196613991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120870 (or 3120867 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 196613991 is about 14021.9111036977. The cubic root of 196613991 is about 581.4844958797.

The spelling of 196613991 in words is "one hundred ninety-six million, six hundred thirteen thousand, nine hundred ninety-one".