131909401 has 12 divisors (see below), whose sum is σ = 145884672. Its totient is φ = 119164656.

The previous prime is 131909369. The next prime is 131909431. The reversal of 131909401 is 104909131.

It is a happy number.

It is not a de Polignac number, because 131909401 - 2⁵ = 131909369 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 131909401.

It is not an unprimeable number, because it can be changed into a prime (131909431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 361 + ... + 16246.

It is an arithmetic number, because the mean of its divisors is an integer number (12157056).

Almost surely, 2^131909401 is an apocalyptic number.

It is an amenable number.

131909401 is a deficient number, since it is larger than the sum of its proper divisors (13975271).

131909401 is a wasteful number, since it uses less digits than its factorization.

131909401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16680 (or 16667 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 131909401 is about 11485.1818009120. The cubic root of 131909401 is about 509.0478209619.

The spelling of 131909401 in words is "one hundred thirty-one million, nine hundred nine thousand, four hundred one".