131721671 has 2 divisors, whose sum is σ = 131721672. Its totient is φ = 131721670.

The previous prime is 131721641. The next prime is 131721701. The reversal of 131721671 is 176127131.

It is a balanced prime because it is at equal distance from previous prime (131721641) and next prime (131721701).

It is a cyclic number.

It is not a de Polignac number, because 131721671 - 2¹⁰ = 131720647 is a prime.

It is a super-2 number, since 2×131721671² = 34701197222064482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131721641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65860835 + 65860836.

It is an arithmetic number, because the mean of its divisors is an integer number (65860836).

Almost surely, 2^131721671 is an apocalyptic number.

131721671 is a deficient number, since it is larger than the sum of its proper divisors (1).

131721671 is an equidigital number, since it uses as much as digits as its factorization.

131721671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 29.

The square root of 131721671 is about 11477.0061862839. The cubic root of 131721671 is about 508.8062184754.

The spelling of 131721671 in words is "one hundred thirty-one million, seven hundred twenty-one thousand, six hundred seventy-one".