196631405 has 4 divisors (see below), whose sum is σ = 235957692. Its totient is φ = 157305120.

The previous prime is 196631387. The next prime is 196631417. The reversal of 196631405 is 504136691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504136691 = 2341 ⋅215351.

It can be written as a sum of positive squares in 2 ways, for example, as 94439524 + 102191881 = 9718^2 + 10109^2 .

It is not a de Polignac number, because 196631405 - 2¹⁶ = 196565869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19663136 + ... + 19663145.

It is an arithmetic number, because the mean of its divisors is an integer number (58989423).

Almost surely, 2^196631405 is an apocalyptic number.

It is an amenable number.

196631405 is a deficient number, since it is larger than the sum of its proper divisors (39326287).

196631405 is an equidigital number, since it uses as much as digits as its factorization.

196631405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39326286.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 196631405 is about 14022.5320466740. The cubic root of 196631405 is about 581.5016626338.

The spelling of 196631405 in words is "one hundred ninety-six million, six hundred thirty-one thousand, four hundred five".