131906693 has 4 divisors (see below), whose sum is σ = 133713708. Its totient is φ = 130099680.

The previous prime is 131906639. The next prime is 131906699. The reversal of 131906693 is 396609131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23059204 + 108847489 = 4802^2 + 10433^2 .

It is a cyclic number.

It is not a de Polignac number, because 131906693 - 2⁶ = 131906629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131906699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903398 + ... + 903543.

It is an arithmetic number, because the mean of its divisors is an integer number (33428427).

Almost surely, 2^131906693 is an apocalyptic number.

It is an amenable number.

131906693 is a deficient number, since it is larger than the sum of its proper divisors (1807015).

131906693 is an equidigital number, since it uses as much as digits as its factorization.

131906693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807014.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 131906693 is about 11485.0639092693. The cubic root of 131906693 is about 509.0443374828.

The spelling of 131906693 in words is "one hundred thirty-one million, nine hundred six thousand, six hundred ninety-three".