147917621 has 4 divisors (see below), whose sum is σ = 148104012. Its totient is φ = 147731232.

The previous prime is 147917617. The next prime is 147917633. The reversal of 147917621 is 126719741.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47416996 + 100500625 = 6886^2 + 10025^2 .

It is a cyclic number.

It is not a de Polignac number, because 147917621 - 2² = 147917617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147917681) 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, 92000 + ... + 93593.

It is an arithmetic number, because the mean of its divisors is an integer number (37026003).

Almost surely, 2^147917621 is an apocalyptic number.

It is an amenable number.

147917621 is a deficient number, since it is larger than the sum of its proper divisors (186391).

147917621 is an equidigital number, since it uses as much as digits as its factorization.

147917621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186390.

The product of its digits is 21168, while the sum is 38.

The square root of 147917621 is about 12162.1388332809. The cubic root of 147917621 is about 528.8590872325.

The spelling of 147917621 in words is "one hundred forty-seven million, nine hundred seventeen thousand, six hundred twenty-one".