1381611 has 16 divisors (see below), whose sum is σ = 2297088. Its totient is φ = 717600.

The previous prime is 1381609. The next prime is 1381613. The reversal of 1381611 is 1161831.

It is an interprime number because it is at equal distance from previous prime (1381609) and next prime (1381613).

It is not a de Polignac number, because 1381611 - 2¹ = 1381609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1381613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2760 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (143568).

2^1381611 is an apocalyptic number.

1381611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1381611 is a deficient number, since it is larger than the sum of its proper divisors (915477).

1381611 is a wasteful number, since it uses less digits than its factorization.

1381611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002.

The product of its digits is 144, while the sum is 21.

The square root of 1381611 is about 1175.4194995830. The cubic root of 1381611 is about 111.3769346077.

The spelling of 1381611 in words is "one million, three hundred eighty-one thousand, six hundred eleven".