545491261 has 4 divisors (see below), whose sum is σ = 623418592. Its totient is φ = 467563932.

The previous prime is 545491241. The next prime is 545491327. The reversal of 545491261 is 162194545.

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.

It is a cyclic number.

It is not a de Polignac number, because 545491261 - 2⁹ = 545490749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545491261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545491231) 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, 38963655 + ... + 38963668.

It is an arithmetic number, because the mean of its divisors is an integer number (155854648).

Almost surely, 2^545491261 is an apocalyptic number.

It is an amenable number.

545491261 is a deficient number, since it is larger than the sum of its proper divisors (77927331).

545491261 is an equidigital number, since it uses as much as digits as its factorization.

545491261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77927330.

The product of its digits is 43200, while the sum is 37.

The square root of 545491261 is about 23355.7543444865. The cubic root of 545491261 is about 817.0762727879.

The spelling of 545491261 in words is "five hundred forty-five million, four hundred ninety-one thousand, two hundred sixty-one".