1509381 has 8 divisors (see below), whose sum is σ = 2236160. Its totient is φ = 1006236.

The previous prime is 1509377. The next prime is 1509407. The reversal of 1509381 is 1839051.

It is not a de Polignac number, because 1509381 - 2² = 1509377 is a prime.

It is a super-2 number, since 2×1509381² = 4556462006322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 55903 = 1509381 / (1 + 5 + 0 + 9 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1509331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27925 + ... + 27978.

It is an arithmetic number, because the mean of its divisors is an integer number (279520).

2^1509381 is an apocalyptic number.

It is an amenable number.

1509381 is a deficient number, since it is larger than the sum of its proper divisors (726779).

1509381 is an equidigital number, since it uses as much as digits as its factorization.

1509381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55912 (or 55906 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1509381 is about 1228.5686793989. The cubic root of 1509381 is about 114.7095632651.

The spelling of 1509381 in words is "one million, five hundred nine thousand, three hundred eighty-one".