131602721 has 16 divisors (see below), whose sum is σ = 141369600. Its totient is φ = 122145408.

The previous prime is 131602693. The next prime is 131602727. The reversal of 131602721 is 127206131.

It is a cyclic number.

It is not a de Polignac number, because 131602721 - 2²² = 127408417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131602727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331295 + ... + 331691.

It is an arithmetic number, because the mean of its divisors is an integer number (8835600).

Almost surely, 2^131602721 is an apocalyptic number.

It is an amenable number.

131602721 is a deficient number, since it is larger than the sum of its proper divisors (9766879).

131602721 is a wasteful number, since it uses less digits than its factorization.

131602721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 131602721 is about 11471.8229152999. The cubic root of 131602721 is about 508.6530148138.

Adding to 131602721 its reverse (127206131), we get a palindrome (258808852).

The spelling of 131602721 in words is "one hundred thirty-one million, six hundred two thousand, seven hundred twenty-one".