945523891 has 4 divisors (see below), whose sum is σ = 1018256512. Its totient is φ = 872791272.

The previous prime is 945523883. The next prime is 945523939. The reversal of 945523891 is 198325549.

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

It is a cyclic number.

It is not a de Polignac number, because 945523891 - 2³ = 945523883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (945523811) 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, 36366291 + ... + 36366316.

It is an arithmetic number, because the mean of its divisors is an integer number (254564128).

Almost surely, 2^945523891 is an apocalyptic number.

945523891 is a deficient number, since it is larger than the sum of its proper divisors (72732621).

945523891 is a wasteful number, since it uses less digits than its factorization.

945523891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72732620.

The product of its digits is 388800, while the sum is 46.

The square root of 945523891 is about 30749.3722049736. The cubic root of 945523891 is about 981.5012015878.

The spelling of 945523891 in words is "nine hundred forty-five million, five hundred twenty-three thousand, eight hundred ninety-one".