131603623 has 4 divisors (see below), whose sum is σ = 132640000. Its totient is φ = 130567248.

The previous prime is 131603609. The next prime is 131603627. The reversal of 131603623 is 326306131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131603623 is a prime.

It is a super-2 number, since 2×131603623² = 34639027173452258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131603627) 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, 517998 + ... + 518251.

It is an arithmetic number, because the mean of its divisors is an integer number (33160000).

Almost surely, 2^131603623 is an apocalyptic number.

131603623 is a deficient number, since it is larger than the sum of its proper divisors (1036377).

131603623 is a wasteful number, since it uses less digits than its factorization.

131603623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036376.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 131603623 is about 11471.8622289496. The cubic root of 131603623 is about 508.6541769072.

Adding to 131603623 its reverse (326306131), we get a palindrome (457909754).

The spelling of 131603623 in words is "one hundred thirty-one million, six hundred three thousand, six hundred twenty-three".