131161601 has 4 divisors (see below), whose sum is σ = 131412912. Its totient is φ = 130910292.

The previous prime is 131161573. The next prime is 131161607. The reversal of 131161601 is 106161131.

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: 106161131 = 1993 ⋅53267.

It is a cyclic number.

It is not a de Polignac number, because 131161601 - 2¹⁰ = 131160577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131161607) 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, 124871 + ... + 125916.

It is an arithmetic number, because the mean of its divisors is an integer number (32853228).

Almost surely, 2^131161601 is an apocalyptic number.

It is an amenable number.

131161601 is a deficient number, since it is larger than the sum of its proper divisors (251311).

131161601 is an equidigital number, since it uses as much as digits as its factorization.

131161601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251310.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 131161601 is about 11452.5805389004. The cubic root of 131161601 is about 508.0840595496.

The spelling of 131161601 in words is "one hundred thirty-one million, one hundred sixty-one thousand, six hundred one".