147144781 has 4 divisors (see below), whose sum is σ = 168165472. Its totient is φ = 126124092.

The previous prime is 147144773. The next prime is 147144787. The reversal of 147144781 is 187441741.

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 147144781 - 2³ = 147144773 is a prime.

It is a super-2 number, since 2×147144781² = 43303173151075922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 147144781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147144787) 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, 10510335 + ... + 10510348.

It is an arithmetic number, because the mean of its divisors is an integer number (42041368).

Almost surely, 2^147144781 is an apocalyptic number.

It is an amenable number.

147144781 is a deficient number, since it is larger than the sum of its proper divisors (21020691).

147144781 is an equidigital number, since it uses as much as digits as its factorization.

147144781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21020690.

The product of its digits is 25088, while the sum is 37.

The square root of 147144781 is about 12130.3248513797. The cubic root of 147144781 is about 527.9364174373.

The spelling of 147144781 in words is "one hundred forty-seven million, one hundred forty-four thousand, seven hundred eighty-one".