1945289945 has 4 divisors (see below), whose sum is σ = 2334347940. Its totient is φ = 1556231952.

The previous prime is 1945289921. The next prime is 1945289947. The reversal of 1945289945 is 5499825491.

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 1460233369 + 485056576 = 38213^2 + 22024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945289945 - 2²² = 1941095641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1945289947) 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, 194528990 + ... + 194528999.

It is an arithmetic number, because the mean of its divisors is an integer number (583586985).

Almost surely, 2^1945289945 is an apocalyptic number.

It is an amenable number.

1945289945 is a deficient number, since it is larger than the sum of its proper divisors (389057995).

1945289945 is an equidigital number, since it uses as much as digits as its factorization.

1945289945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389057994.

The product of its digits is 4665600, while the sum is 56.

The square root of 1945289945 is about 44105.4412176094. The cubic root of 1945289945 is about 1248.3262815334.

The spelling of 1945289945 in words is "one billion, nine hundred forty-five million, two hundred eighty-nine thousand, nine hundred forty-five".