5425181721 has 12 divisors (see below), whose sum is σ = 8048167972. Its totient is φ = 3519036576.

The previous prime is 5425181719. The next prime is 5425181743. The reversal of 5425181721 is 1271815245.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4725050121 + 700131600 = 68739^2 + 26460^2 .

It is not a de Polignac number, because 5425181721 - 2¹ = 5425181719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5425181711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8145586 + ... + 8146251.

Almost surely, 2^5425181721 is an apocalyptic number.

It is an amenable number.

5425181721 is a deficient number, since it is larger than the sum of its proper divisors (2622986251).

5425181721 is a wasteful number, since it uses less digits than its factorization.

5425181721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16291880 (or 16291877 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 5425181721 is about 73655.8329054801. The cubic root of 5425181721 is about 1757.1335184541.

Adding to 5425181721 its reverse (1271815245), we get a palindrome (6696996966).

The spelling of 5425181721 in words is "five billion, four hundred twenty-five million, one hundred eighty-one thousand, seven hundred twenty-one".