131215646 has 16 divisors (see below), whose sum is σ = 200735280. Its totient is φ = 64310400.

The previous prime is 131215627. The next prime is 131215649. The reversal of 131215646 is 646512131.

It is a happy number.

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, 45446 + ... + 48246.

It is an arithmetic number, because the mean of its divisors is an integer number (12545955).

Almost surely, 2^131215646 is an apocalyptic number.

131215646 is a deficient number, since it is larger than the sum of its proper divisors (69519634).

131215646 is a wasteful number, since it uses less digits than its factorization.

131215646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259.

The product of its digits is 4320, while the sum is 29.

The square root of 131215646 is about 11454.9398077860. The cubic root of 131215646 is about 508.1538351346.

Adding to 131215646 its reverse (646512131), we get a palindrome (777727777).

The spelling of 131215646 in words is "one hundred thirty-one million, two hundred fifteen thousand, six hundred forty-six".