132705721 has 2 divisors, whose sum is σ = 132705722. Its totient is φ = 132705720.

The previous prime is 132705679. The next prime is 132705733. The reversal of 132705721 is 127507231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125888400 + 6817321 = 11220^2 + 2611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-132705721 is a prime.

It is a super-2 number, since 2×132705721² = 35221616772259682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 132705721.

It is not a weakly prime, because it can be changed into another prime (132705121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66352860 + 66352861.

It is an arithmetic number, because the mean of its divisors is an integer number (66352861).

Almost surely, 2^132705721 is an apocalyptic number.

It is an amenable number.

132705721 is a deficient number, since it is larger than the sum of its proper divisors (1).

132705721 is an equidigital number, since it uses as much as digits as its factorization.

132705721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 132705721 is about 11519.7969166127. The cubic root of 132705721 is about 510.0701185150.

The spelling of 132705721 in words is "one hundred thirty-two million, seven hundred five thousand, seven hundred twenty-one".