1427448581 has 4 divisors (see below), whose sum is σ = 1537252332. Its totient is φ = 1317644832.

The previous prime is 1427448569. The next prime is 1427448611. The reversal of 1427448581 is 1858447241.

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 700660900 + 726787681 = 26470^2 + 26959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1427448581 - 2¹⁰ = 1427447557 is a prime.

It is a super-2 number, since 2×1427448581² = 4075218902797827122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1427445581) 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, 54901856 + ... + 54901881.

It is an arithmetic number, because the mean of its divisors is an integer number (384313083).

Almost surely, 2^1427448581 is an apocalyptic number.

It is an amenable number.

1427448581 is a deficient number, since it is larger than the sum of its proper divisors (109803751).

1427448581 is a wasteful number, since it uses less digits than its factorization.

1427448581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109803750.

The product of its digits is 286720, while the sum is 44.

The square root of 1427448581 is about 37781.5905038419. The cubic root of 1427448581 is about 1125.9527286716.

The spelling of 1427448581 in words is "one billion, four hundred twenty-seven million, four hundred forty-eight thousand, five hundred eighty-one".