132451681 has 4 divisors (see below), whose sum is σ = 133264432. Its totient is φ = 131638932.

The previous prime is 132451667. The next prime is 132451691. The reversal of 132451681 is 186154231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 132451681 - 2⁹ = 132451169 is a prime.

It is a super-2 number, since 2×132451681² = 35086895599451522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (132451621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406131 + ... + 406456.

It is an arithmetic number, because the mean of its divisors is an integer number (33316108).

Almost surely, 2^132451681 is an apocalyptic number.

It is an amenable number.

132451681 is a deficient number, since it is larger than the sum of its proper divisors (812751).

132451681 is an equidigital number, since it uses as much as digits as its factorization.

132451681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812750.

The product of its digits is 5760, while the sum is 31.

The square root of 132451681 is about 11508.7653985995. The cubic root of 132451681 is about 509.7444330200.

The spelling of 132451681 in words is "one hundred thirty-two million, four hundred fifty-one thousand, six hundred eighty-one".