196749561 has 4 divisors (see below), whose sum is σ = 262332752. Its totient is φ = 131166372.

The previous prime is 196749557. The next prime is 196749643. The reversal of 196749561 is 165947691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 196749561 - 2² = 196749557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 196749561.

It is not an unprimeable number, because it can be changed into a prime (196749361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32791591 + ... + 32791596.

It is an arithmetic number, because the mean of its divisors is an integer number (65583188).

Almost surely, 2^196749561 is an apocalyptic number.

It is an amenable number.

196749561 is a deficient number, since it is larger than the sum of its proper divisors (65583191).

196749561 is an equidigital number, since it uses as much as digits as its factorization.

196749561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65583190.

The product of its digits is 408240, while the sum is 48.

The square root of 196749561 is about 14026.7444904368. The cubic root of 196749561 is about 581.6181142807.

The spelling of 196749561 in words is "one hundred ninety-six million, seven hundred forty-nine thousand, five hundred sixty-one".