147618821 has 6 divisors (see below), whose sum is σ = 171719910. Its totient is φ = 126530376.

The previous prime is 147618817. The next prime is 147618827. The reversal of 147618821 is 128816741.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 136656100 + 10962721 = 11690^2 + 3311^2 .

It is not a de Polignac number, because 147618821 - 2² = 147618817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147618827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1506266 + ... + 1506363.

It is an arithmetic number, because the mean of its divisors is an integer number (28619985).

Almost surely, 2^147618821 is an apocalyptic number.

It is an amenable number.

147618821 is a deficient number, since it is larger than the sum of its proper divisors (24101089).

147618821 is an equidigital number, since it uses as much as digits as its factorization.

147618821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012643 (or 3012636 counting only the distinct ones).

The product of its digits is 21504, while the sum is 38.

The square root of 147618821 is about 12149.8485998798. The cubic root of 147618821 is about 528.5027410936.

The spelling of 147618821 in words is "one hundred forty-seven million, six hundred eighteen thousand, eight hundred twenty-one".