131721610 has 16 divisors (see below), whose sum is σ = 251046216. Its totient is φ = 49589248.

The previous prime is 131721563. The next prime is 131721613. The reversal of 131721610 is 16127131.

It can be written as a sum of positive squares in 4 ways, for example, as 102637161 + 29084449 = 10131^2 + 5393^2 .

It is not an unprimeable number, because it can be changed into a prime (131721613) 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, 387247 + ... + 387586.

Almost surely, 2^131721610 is an apocalyptic number.

131721610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131721610 is a deficient number, since it is larger than the sum of its proper divisors (119324606).

131721610 is a wasteful number, since it uses less digits than its factorization.

131721610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774857.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 131721610 is about 11477.0035287962. The cubic root of 131721610 is about 508.8061399331.

Adding to 131721610 its reverse (16127131), we get a palindrome (147848741).

The spelling of 131721610 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, six hundred ten".