131215645 has 8 divisors (see below), whose sum is σ = 171773280. Its totient is φ = 95429520.

The previous prime is 131215627. The next prime is 131215649. The reversal of 131215645 is 546512131.

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

It is not a de Polignac number, because 131215645 - 2¹⁷ = 131084573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131215649) 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, 1192815 + ... + 1192924.

It is an arithmetic number, because the mean of its divisors is an integer number (21471660).

Almost surely, 2^131215645 is an apocalyptic number.

It is an amenable number.

131215645 is a deficient number, since it is larger than the sum of its proper divisors (40557635).

131215645 is a wasteful number, since it uses less digits than its factorization.

131215645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385755.

The product of its digits is 3600, while the sum is 28.

The square root of 131215645 is about 11454.9397641367. The cubic root of 131215645 is about 508.1538338437.

Adding to 131215645 its reverse (546512131), we get a palindrome (677727776).

The spelling of 131215645 in words is "one hundred thirty-one million, two hundred fifteen thousand, six hundred forty-five".