1447147661 has 4 divisors (see below), whose sum is σ = 1532274012. Its totient is φ = 1362021312.

The previous prime is 1447147651. The next prime is 1447147679. The reversal of 1447147661 is 1667417441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1667417441 = 5953 ⋅280097.

It can be written as a sum of positive squares in 2 ways, for example, as 1155592036 + 291555625 = 33994^2 + 17075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1447147661 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 (1447147621) 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, 42563150 + ... + 42563183.

It is an arithmetic number, because the mean of its divisors is an integer number (383068503).

Almost surely, 2^1447147661 is an apocalyptic number.

It is an amenable number.

1447147661 is a deficient number, since it is larger than the sum of its proper divisors (85126351).

1447147661 is an equidigital number, since it uses as much as digits as its factorization.

1447147661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85126350.

The product of its digits is 112896, while the sum is 41.

The square root of 1447147661 is about 38041.3940464857. The cubic root of 1447147661 is about 1131.1085425067.

The spelling of 1447147661 in words is "one billion, four hundred forty-seven million, one hundred forty-seven thousand, six hundred sixty-one".