147813121 has 4 divisors (see below), whose sum is σ = 147841200. Its totient is φ = 147785044.

The previous prime is 147813049. The next prime is 147813139. The reversal of 147813121 is 121318741.

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: 121318741 = 523 ⋅231967.

It is a cyclic number.

It is not a de Polignac number, because 147813121 - 2¹⁷ = 147682049 is a prime.

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 147813121.

It is not an unprimeable number, because it can be changed into a prime (147813151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3511 + ... + 17548.

It is an arithmetic number, because the mean of its divisors is an integer number (36960300).

Almost surely, 2^147813121 is an apocalyptic number.

It is an amenable number.

147813121 is a deficient number, since it is larger than the sum of its proper divisors (28079).

147813121 is an equidigital number, since it uses as much as digits as its factorization.

147813121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28078.

The product of its digits is 1344, while the sum is 28.

The square root of 147813121 is about 12157.8419548866. The cubic root of 147813121 is about 528.7345161053.

The spelling of 147813121 in words is "one hundred forty-seven million, eight hundred thirteen thousand, one hundred twenty-one".