132921781 has 4 divisors (see below), whose sum is σ = 135749952. Its totient is φ = 130093612.

The previous prime is 132921779. The next prime is 132921791. The reversal of 132921781 is 187129231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 187129231 = 47 ⋅3981473.

It is a cyclic number.

It is not a de Polignac number, because 132921781 - 2¹ = 132921779 is a prime.

It is a super-2 number, since 2×132921781² = 35336399728423922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (132921731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1414015 + ... + 1414108.

It is an arithmetic number, because the mean of its divisors is an integer number (33937488).

Almost surely, 2^132921781 is an apocalyptic number.

It is an amenable number.

132921781 is a deficient number, since it is larger than the sum of its proper divisors (2828171).

132921781 is an equidigital number, since it uses as much as digits as its factorization.

132921781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828170.

The product of its digits is 6048, while the sum is 34.

The square root of 132921781 is about 11529.1708721833. The cubic root of 132921781 is about 510.3467858002.

The spelling of 132921781 in words is "one hundred thirty-two million, nine hundred twenty-one thousand, seven hundred eighty-one".