147739681 has 4 divisors (see below), whose sum is σ = 147807792. Its totient is φ = 147671572.

The previous prime is 147739661. The next prime is 147739747. The reversal of 147739681 is 186937741.

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: 186937741 = 29 ⋅6446129.

It is a cyclic number.

It is not a de Polignac number, because 147739681 - 2⁹ = 147739169 is a prime.

It is a super-2 number, since 2×147739681² = 43654026683963522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147739661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30691 + ... + 35176.

It is an arithmetic number, because the mean of its divisors is an integer number (36951948).

Almost surely, 2^147739681 is an apocalyptic number.

It is an amenable number.

147739681 is a deficient number, since it is larger than the sum of its proper divisors (68111).

147739681 is an equidigital number, since it uses as much as digits as its factorization.

147739681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68110.

The product of its digits is 254016, while the sum is 46.

The square root of 147739681 is about 12154.8213067902. The cubic root of 147739681 is about 528.6469354827.

The spelling of 147739681 in words is "one hundred forty-seven million, seven hundred thirty-nine thousand, six hundred eighty-one".