147445621 has 4 divisors (see below), whose sum is σ = 147475744. Its totient is φ = 147415500.

The previous prime is 147445589. The next prime is 147445637. The reversal of 147445621 is 126544741.

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.

It is a cyclic number.

It is not a de Polignac number, because 147445621 - 2⁵ = 147445589 is a prime.

It is a super-2 number, since 2×147445621² = 43480422304151282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147445121) 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, 5835 + ... + 18136.

It is an arithmetic number, because the mean of its divisors is an integer number (36868936).

Almost surely, 2^147445621 is an apocalyptic number.

It is an amenable number.

147445621 is a deficient number, since it is larger than the sum of its proper divisors (30123).

147445621 is an equidigital number, since it uses as much as digits as its factorization.

147445621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30122.

The product of its digits is 26880, while the sum is 34.

The square root of 147445621 is about 12142.7188471116. The cubic root of 147445621 is about 528.2959641681.

The spelling of 147445621 in words is "one hundred forty-seven million, four hundred forty-five thousand, six hundred twenty-one".