131605401 has 16 divisors (see below), whose sum is σ = 178534400. Its totient is φ = 86220288.

The previous prime is 131605391. The next prime is 131605417. The reversal of 131605401 is 104506131.

It is not a de Polignac number, because 131605401 - 2¹⁰ = 131604377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131605421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39945 + ... + 43113.

It is an arithmetic number, because the mean of its divisors is an integer number (11158400).

Almost surely, 2^131605401 is an apocalyptic number.

It is an amenable number.

131605401 is a deficient number, since it is larger than the sum of its proper divisors (46928999).

131605401 is a wasteful number, since it uses less digits than its factorization.

131605401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 131605401 is about 11471.9397226450. The cubic root of 131605401 is about 508.6564675814.

The spelling of 131605401 in words is "one hundred thirty-one million, six hundred five thousand, four hundred one".