1975445009 has 4 divisors (see below), whose sum is σ = 1975551216. Its totient is φ = 1975338804.

The previous prime is 1975444987. The next prime is 1975445011. The reversal of 1975445009 is 9005445791.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9005445791 = 131 ⋅68743861.

It is a cyclic number.

It is not a de Polignac number, because 1975445009 - 2²⁰ = 1974396433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1975445909) 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, 17039 + ... + 65124.

It is an arithmetic number, because the mean of its divisors is an integer number (493887804).

Almost surely, 2^1975445009 is an apocalyptic number.

It is an amenable number.

1975445009 is a deficient number, since it is larger than the sum of its proper divisors (106207).

1975445009 is an equidigital number, since it uses as much as digits as its factorization.

1975445009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106206.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 1975445009 is about 44445.9785469957. The cubic root of 1975445009 is about 1254.7435779241.

The spelling of 1975445009 in words is "one billion, nine hundred seventy-five million, four hundred forty-five thousand, nine".