134197561 has 4 divisors (see below), whose sum is σ = 134489124. Its totient is φ = 133906000.

The previous prime is 134197559. The next prime is 134197573. The reversal of 134197561 is 165791431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165791431 = 13 ⋅12753187.

It can be written as a sum of positive squares in 2 ways, for example, as 82083600 + 52113961 = 9060^2 + 7219^2 .

It is a cyclic number.

It is not a de Polignac number, because 134197561 - 2¹ = 134197559 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 134197561.

It is not an unprimeable number, because it can be changed into a prime (134192561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145090 + ... + 146011.

It is an arithmetic number, because the mean of its divisors is an integer number (33622281).

Almost surely, 2^134197561 is an apocalyptic number.

It is an amenable number.

134197561 is a deficient number, since it is larger than the sum of its proper divisors (291563).

134197561 is an equidigital number, since it uses as much as digits as its factorization.

134197561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291562.

The product of its digits is 22680, while the sum is 37.

The square root of 134197561 is about 11584.3670953574. The cubic root of 134197561 is about 511.9743550489.

The spelling of 134197561 in words is "one hundred thirty-four million, one hundred ninety-seven thousand, five hundred sixty-one".