131640355 has 32 divisors (see below), whose sum is σ = 197733888. Its totient is φ = 81734400.

The previous prime is 131640343. The next prime is 131640361. The reversal of 131640355 is 553046131.

131640355 = 1520² + 1521² + ... + 1574².

It is not a de Polignac number, because 131640355 - 2¹⁹ = 131116067 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126919 + ... + 127951.

It is an arithmetic number, because the mean of its divisors is an integer number (6179184).

Almost surely, 2^131640355 is an apocalyptic number.

131640355 is a deficient number, since it is larger than the sum of its proper divisors (66093533).

131640355 is a wasteful number, since it uses less digits than its factorization.

131640355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 131640355 is about 11473.4630779029. The cubic root of 131640355 is about 508.7014961395.

Adding to 131640355 its reverse (553046131), we get a palindrome (684686486).

The spelling of 131640355 in words is "one hundred thirty-one million, six hundred forty thousand, three hundred fifty-five".