19085601961 has 4 divisors (see below), whose sum is σ = 19409086800. Its totient is φ = 18762117124.

The previous prime is 19085601959. The next prime is 19085601979. The reversal of 19085601961 is 16910658091.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16910658091 = 353 ⋅47905547.

It is a cyclic number.

It is not a de Polignac number, because 19085601961 - 2¹ = 19085601959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19085601761) by changing a digit.

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, 161742331 + ... + 161742448.

It is an arithmetic number, because the mean of its divisors is an integer number (4852271700).

Almost surely, 2^19085601961 is an apocalyptic number.

It is an amenable number.

19085601961 is a deficient number, since it is larger than the sum of its proper divisors (323484839).

19085601961 is an equidigital number, since it uses as much as digits as its factorization.

19085601961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323484838.

The product of its (nonzero) digits is 116640, while the sum is 46.

The spelling of 19085601961 in words is "nineteen billion, eighty-five million, six hundred one thousand, nine hundred sixty-one".