147106781 has 4 divisors (see below), whose sum is σ = 153502752. Its totient is φ = 140710812.

The previous prime is 147106777. The next prime is 147106787. The reversal of 147106781 is 187601741.

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: 187601741 = 577 ⋅325133.

It is a cyclic number.

It is not a de Polignac number, because 147106781 - 2² = 147106777 is a prime.

It is a super-2 number, since 2×147106781² = 43280810032363922, 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 (147106787) 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, 3197951 + ... + 3197996.

It is an arithmetic number, because the mean of its divisors is an integer number (38375688).

Almost surely, 2^147106781 is an apocalyptic number.

It is an amenable number.

147106781 is a deficient number, since it is larger than the sum of its proper divisors (6395971).

147106781 is an equidigital number, since it uses as much as digits as its factorization.

147106781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6395970.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 147106781 is about 12128.7584278029. The cubic root of 147106781 is about 527.8909671651.

The spelling of 147106781 in words is "one hundred forty-seven million, one hundred six thousand, seven hundred eighty-one".