131605423700 has 18 divisors (see below), whose sum is σ = 285583769646. Its totient is φ = 52642169440.

The previous prime is 131605423627. The next prime is 131605423723. The reversal of 131605423700 is 7324506131.

It can be written as a sum of positive squares in 3 ways, for example, as 18700015504 + 112905408196 = 136748^2 + 336014^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 658027019 + ... + 658027218.

Almost surely, 2^131605423700 is an apocalyptic number.

131605423700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131605423700 is an abundant number, since it is smaller than the sum of its proper divisors (153978345946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131605423700 is a wasteful number, since it uses less digits than its factorization.

131605423700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316054251 (or 1316054244 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

Adding to 131605423700 its reverse (7324506131), we get a palindrome (138929929831).

The spelling of 131605423700 in words is "one hundred thirty-one billion, six hundred five million, four hundred twenty-three thousand, seven hundred".