1613993161 has 4 divisors (see below), whose sum is σ = 1760719824. Its totient is φ = 1467266500.

The previous prime is 1613993159. The next prime is 1613993177.

1613993161 is nontrivially palindromic in base 10.

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 a cyclic number.

It is not a de Polignac number, because 1613993161 - 2¹ = 1613993159 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613993561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73363315 + ... + 73363336.

It is an arithmetic number, because the mean of its divisors is an integer number (440179956).

Almost surely, 2^1613993161 is an apocalyptic number.

1613993161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1613993161 is a deficient number, since it is larger than the sum of its proper divisors (146726663).

1613993161 is a wasteful number, since it uses less digits than its factorization.

1613993161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146726662.

The product of its digits is 26244, while the sum is 40.

The square root of 1613993161 is about 40174.5337371823. The cubic root of 1613993161 is about 1173.0068908190.

The spelling of 1613993161 in words is "one billion, six hundred thirteen million, nine hundred ninety-three thousand, one hundred sixty-one".