147516821 has 2 divisors, whose sum is σ = 147516822. Its totient is φ = 147516820.

The previous prime is 147516797. The next prime is 147516829. The reversal of 147516821 is 128615741.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78127921 + 69388900 = 8839^2 + 8330^2 .

It is an emirp because it is prime and its reverse (128615741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147516821 - 2⁶ = 147516757 is a prime.

It is a super-2 number, since 2×147516821² = 43522424955892082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147516829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73758410 + 73758411.

It is an arithmetic number, because the mean of its divisors is an integer number (73758411).

Almost surely, 2^147516821 is an apocalyptic number.

It is an amenable number.

147516821 is a deficient number, since it is larger than the sum of its proper divisors (1).

147516821 is an equidigital number, since it uses as much as digits as its factorization.

147516821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 147516821 is about 12145.6502913595. The cubic root of 147516821 is about 528.3809867444.

The spelling of 147516821 in words is "one hundred forty-seven million, five hundred sixteen thousand, eight hundred twenty-one".