5445781421 has 4 divisors (see below), whose sum is σ = 5459096700. Its totient is φ = 5432466144.

The previous prime is 5445781409. The next prime is 5445781423. The reversal of 5445781421 is 1241875445.

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 4330956100 + 1114825321 = 65810^2 + 33389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5445781421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5445781423) 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, 6657026 + ... + 6657843.

It is an arithmetic number, because the mean of its divisors is an integer number (1364774175).

Almost surely, 2^5445781421 is an apocalyptic number.

It is an amenable number.

5445781421 is a deficient number, since it is larger than the sum of its proper divisors (13315279).

5445781421 is a wasteful number, since it uses less digits than its factorization.

5445781421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13315278.

The product of its digits is 179200, while the sum is 41.

The square root of 5445781421 is about 73795.5379477648. The cubic root of 5445781421 is about 1759.3546856184.

The spelling of 5445781421 in words is "five billion, four hundred forty-five million, seven hundred eighty-one thousand, four hundred twenty-one".