131640145 has 16 divisors (see below), whose sum is σ = 194423040. Its totient is φ = 83323584.

The previous prime is 131640143. The next prime is 131640161. The reversal of 131640145 is 541046131.

It is a cyclic number.

It is not a de Polignac number, because 131640145 - 2¹ = 131640143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131640143) 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, 144205 + ... + 145114.

It is an arithmetic number, because the mean of its divisors is an integer number (12151440).

Almost surely, 2^131640145 is an apocalyptic number.

It is an amenable number.

131640145 is a deficient number, since it is larger than the sum of its proper divisors (62782895).

131640145 is a wasteful number, since it uses less digits than its factorization.

131640145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289344.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 131640145 is about 11473.4539263467. The cubic root of 131640145 is about 508.7012256364.

Adding to 131640145 its reverse (541046131), we get a palindrome (672686276).

The spelling of 131640145 in words is "one hundred thirty-one million, six hundred forty thousand, one hundred forty-five".