131909787 has 12 divisors (see below), whose sum is σ = 191298744. Its totient is φ = 87588000.

The previous prime is 131909779. The next prime is 131909803. The reversal of 131909787 is 787909131.

It is not a de Polignac number, because 131909787 - 2³ = 131909779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131909747) 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, 26938 + ... + 31455.

It is an arithmetic number, because the mean of its divisors is an integer number (15941562).

Almost surely, 2^131909787 is an apocalyptic number.

131909787 is a deficient number, since it is larger than the sum of its proper divisors (59388957).

131909787 is a wasteful number, since it uses less digits than its factorization.

131909787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58650 (or 58647 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 131909787 is about 11485.1986051613. The cubic root of 131909787 is about 509.0483174953.

The spelling of 131909787 in words is "one hundred thirty-one million, nine hundred nine thousand, seven hundred eighty-seven".