545745921 has 8 divisors (see below), whose sum is σ = 831612864. Its totient is φ = 311854800.

The previous prime is 545745913. The next prime is 545745947. The reversal of 545745921 is 129547545.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 545745921 - 2³ = 545745913 is a prime.

It is a super-2 number, since 2×545745921² = 595677220576276482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (545745901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12993930 + ... + 12993971.

It is an arithmetic number, because the mean of its divisors is an integer number (103951608).

Almost surely, 2^545745921 is an apocalyptic number.

It is an amenable number.

545745921 is a deficient number, since it is larger than the sum of its proper divisors (285866943).

545745921 is a wasteful number, since it uses less digits than its factorization.

545745921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25987911.

The product of its digits is 252000, while the sum is 42.

The square root of 545745921 is about 23361.2054697526. The cubic root of 545745921 is about 817.2034023969.

The spelling of 545745921 in words is "five hundred forty-five million, seven hundred forty-five thousand, nine hundred twenty-one".