131263945 has 8 divisors (see below), whose sum is σ = 158205960. Its totient is φ = 104551680.

The previous prime is 131263933. The next prime is 131263963. The reversal of 131263945 is 549362131.

It can be written as a sum of positive squares in 4 ways, for example, as 59166864 + 72097081 = 7692^2 + 8491^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-131263945 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131263945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56176 + ... + 58465.

It is an arithmetic number, because the mean of its divisors is an integer number (19775745).

Almost surely, 2^131263945 is an apocalyptic number.

It is an amenable number.

131263945 is a deficient number, since it is larger than the sum of its proper divisors (26942015).

131263945 is a wasteful number, since it uses less digits than its factorization.

131263945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114875.

The product of its digits is 19440, while the sum is 34.

The square root of 131263945 is about 11457.0478309205. The cubic root of 131263945 is about 508.2161760522.

It can be divided in two parts, 13126 and 3945, that added together give a palindrome (17071).

The spelling of 131263945 in words is "one hundred thirty-one million, two hundred sixty-three thousand, nine hundred forty-five".