147816121 has 4 divisors (see below), whose sum is σ = 147864052. Its totient is φ = 147768192.

The previous prime is 147816089. The next prime is 147816131. The reversal of 147816121 is 121618741.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121618741 = 37 ⋅3286993.

It can be written as a sum of positive squares in 2 ways, for example, as 76650025 + 71166096 = 8755^2 + 8436^2 .

It is a cyclic number.

It is not a de Polignac number, because 147816121 - 2⁵ = 147816089 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147816131) 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, 18996 + ... + 25621.

It is an arithmetic number, because the mean of its divisors is an integer number (36966013).

It is a 3084-hyperperfect number.

Almost surely, 2^147816121 is an apocalyptic number.

It is an amenable number.

147816121 is a deficient number, since it is larger than the sum of its proper divisors (47931).

147816121 is an equidigital number, since it uses as much as digits as its factorization.

147816121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47930.

The product of its digits is 2688, while the sum is 31.

The square root of 147816121 is about 12157.9653314196. The cubic root of 147816121 is about 528.7380931283.

It can be divided in two parts, 14781 and 6121, that added together give a palindrome (20902).

The spelling of 147816121 in words is "one hundred forty-seven million, eight hundred sixteen thousand, one hundred twenty-one".