131021315 has 4 divisors (see below), whose sum is σ = 157225584. Its totient is φ = 104817048.

The previous prime is 131021311. The next prime is 131021323. The reversal of 131021315 is 513120131.

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

It is a cyclic number.

It is not a de Polignac number, because 131021315 - 2² = 131021311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131021293 and 131021302.

It is not an unprimeable number, because it can be changed into a prime (131021311) 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, 13102127 + ... + 13102136.

It is an arithmetic number, because the mean of its divisors is an integer number (39306396).

Almost surely, 2^131021315 is an apocalyptic number.

131021315 is a deficient number, since it is larger than the sum of its proper divisors (26204269).

131021315 is an equidigital number, since it uses as much as digits as its factorization.

131021315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26204268.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 131021315 is about 11446.4542544842. The cubic root of 131021315 is about 507.9028517703.

Adding to 131021315 its reverse (513120131), we get a palindrome (644141446).

The spelling of 131021315 in words is "one hundred thirty-one million, twenty-one thousand, three hundred fifteen".