1485815381 has 4 divisors (see below), whose sum is σ = 1486562892. Its totient is φ = 1485067872.

The previous prime is 1485815363. The next prime is 1485815393. The reversal of 1485815381 is 1835185841.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1835185841 = 379 ⋅4842179.

It can be written as a sum of positive squares in 2 ways, for example, as 1213895281 + 271920100 = 34841^2 + 16490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1485815381 - 2¹⁰ = 1485814357 is a prime.

It is a super-2 number, since 2×1485815381² = 4415294692832350322, which 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 (1485818381) 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, 370766 + ... + 374751.

It is an arithmetic number, because the mean of its divisors is an integer number (371640723).

Almost surely, 2^1485815381 is an apocalyptic number.

It is an amenable number.

1485815381 is a deficient number, since it is larger than the sum of its proper divisors (747511).

1485815381 is an equidigital number, since it uses as much as digits as its factorization.

1485815381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747510.

The product of its digits is 153600, while the sum is 44.

The square root of 1485815381 is about 38546.2758382700. The cubic root of 1485815381 is about 1141.0945118187.

The spelling of 1485815381 in words is "one billion, four hundred eighty-five million, eight hundred fifteen thousand, three hundred eighty-one".