1331505 has 32 divisors (see below), whose sum is σ = 2707200. Its totient is φ = 608256.

The previous prime is 1331497. The next prime is 1331513. The reversal of 1331505 is 5051331.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1331497) and next prime (1331513).

It is not a de Polignac number, because 1331505 - 2³ = 1331497 is a prime.

1331505 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241 + ... + 1649.

It is an arithmetic number, because the mean of its divisors is an integer number (84600).

2^1331505 is an apocalyptic number.

1331505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331505 is an abundant number, since it is smaller than the sum of its proper divisors (1375695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331505 is a wasteful number, since it uses less digits than its factorization.

1331505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430 (or 1424 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

The square root of 1331505 is about 1153.9085752346. The cubic root of 1331505 is about 110.0139100867.

Adding to 1331505 its reverse (5051331), we get a palindrome (6382836).

The spelling of 1331505 in words is "one million, three hundred thirty-one thousand, five hundred five".