1381091 has 4 divisors (see below), whose sum is σ = 1453800. Its totient is φ = 1308384.

The previous prime is 1381069. The next prime is 1381103. The reversal of 1381091 is 1901831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1381091 - 2⁶ = 1381027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381291) 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, 36326 + ... + 36363.

It is an arithmetic number, because the mean of its divisors is an integer number (363450).

2^1381091 is an apocalyptic number.

1381091 is a deficient number, since it is larger than the sum of its proper divisors (72709).

1381091 is an equidigital number, since it uses as much as digits as its factorization.

1381091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72708.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1381091 is about 1175.1982811424. The cubic root of 1381091 is about 111.3629597929.

The spelling of 1381091 in words is "one million, three hundred eighty-one thousand, ninety-one".