131909691 has 8 divisors (see below), whose sum is σ = 176019984. Its totient is φ = 87869600.

The previous prime is 131909689. The next prime is 131909747. The reversal of 131909691 is 196909131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131909691 - 2¹ = 131909689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131909671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12996 + ... + 20801.

It is an arithmetic number, because the mean of its divisors is an integer number (22002498).

Almost surely, 2^131909691 is an apocalyptic number.

131909691 is a deficient number, since it is larger than the sum of its proper divisors (44110293).

131909691 is a wasteful number, since it uses less digits than its factorization.

131909691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35101.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 131909691 is about 11485.1944258685. The cubic root of 131909691 is about 509.0481940052.

The spelling of 131909691 in words is "one hundred thirty-one million, nine hundred nine thousand, six hundred ninety-one".