131745245 has 4 divisors (see below), whose sum is σ = 158094300. Its totient is φ = 105396192.

The previous prime is 131745241. The next prime is 131745247. The reversal of 131745245 is 542547131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542547131 = 7 ⋅77506733.

It can be written as a sum of positive squares in 2 ways, for example, as 45738169 + 86007076 = 6763^2 + 9274^2 .

It is a cyclic number.

It is not a de Polignac number, because 131745245 - 2² = 131745241 is a prime.

It is a super-2 number, since 2×131745245² = 34713619160220050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131745241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13174520 + ... + 13174529.

It is an arithmetic number, because the mean of its divisors is an integer number (39523575).

Almost surely, 2^131745245 is an apocalyptic number.

It is an amenable number.

131745245 is a deficient number, since it is larger than the sum of its proper divisors (26349055).

131745245 is an equidigital number, since it uses as much as digits as its factorization.

131745245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26349054.

The product of its digits is 16800, while the sum is 32.

The square root of 131745245 is about 11478.0331503268. The cubic root of 131745245 is about 508.8365700549.

The spelling of 131745245 in words is "one hundred thirty-one million, seven hundred forty-five thousand, two hundred forty-five".