131721715 has 8 divisors (see below), whose sum is σ = 158183568. Its totient is φ = 105299040.

The previous prime is 131721703. The next prime is 131721721. The reversal of 131721715 is 517127131.

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

It is not a de Polignac number, because 131721715 - 2¹⁷ = 131590643 is a prime.

It is a super-2 number, since 2×131721715² = 34701220405082450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1801 + ... + 16330.

It is an arithmetic number, because the mean of its divisors is an integer number (19772946).

Almost surely, 2^131721715 is an apocalyptic number.

131721715 is a deficient number, since it is larger than the sum of its proper divisors (26461853).

131721715 is a wasteful number, since it uses less digits than its factorization.

131721715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19589.

The product of its digits is 1470, while the sum is 28.

The square root of 131721715 is about 11477.0081031600. The cubic root of 131721715 is about 508.8062751289.

Adding to 131721715 its reverse (517127131), we get a palindrome (648848846).

It can be divided in two parts, 1317 and 21715, that added together give a palindrome (23032).

The spelling of 131721715 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, seven hundred fifteen".