131515345 has 8 divisors (see below), whose sum is σ = 169958376. Its totient is φ = 97118976.

The previous prime is 131515343. The next prime is 131515379. The reversal of 131515345 is 543515131.

It can be written as a sum of positive squares in 4 ways, for example, as 3101121 + 128414224 = 1761^2 + 11332^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131515345 - 2¹ = 131515343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131515343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011592 + ... + 1011721.

It is an arithmetic number, because the mean of its divisors is an integer number (21244797).

Almost surely, 2^131515345 is an apocalyptic number.

It is an amenable number.

131515345 is a deficient number, since it is larger than the sum of its proper divisors (38443031).

131515345 is a wasteful number, since it uses less digits than its factorization.

131515345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023331.

The product of its digits is 4500, while the sum is 28.

The square root of 131515345 is about 11468.0139954571. The cubic root of 131515345 is about 508.5404185971.

It can be divided in two parts, 13151 and 5345, that added together give a square (18496 = 136²).

The spelling of 131515345 in words is "one hundred thirty-one million, five hundred fifteen thousand, three hundred forty-five".