1427246243581 has 4 divisors (see below), whose sum is σ = 1427249007964. Its totient is φ = 1427243479200.

The previous prime is 1427246243573. The next prime is 1427246243609. The reversal of 1427246243581 is 1853426427241.

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 1205748940356 + 221497303225 = 1098066^2 + 470635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1427246243581 - 2³ = 1427246243573 is a prime.

It is a super-2 number, since 2×1427246243581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1427246243981) 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, 351600 + ... + 1725721.

It is an arithmetic number, because the mean of its divisors is an integer number (356812251991).

Almost surely, 2^{1427246243581} is an apocalyptic number.

It is an amenable number.

1427246243581 is a deficient number, since it is larger than the sum of its proper divisors (2764383).

1427246243581 is an equidigital number, since it uses as much as digits as its factorization.

1427246243581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764382.

The product of its digits is 2580480, while the sum is 49.

The spelling of 1427246243581 in words is "one trillion, four hundred twenty-seven billion, two hundred forty-six million, two hundred forty-three thousand, five hundred eighty-one".