1681155 has 40 divisors (see below), whose sum is σ = 3449952. Its totient is φ = 767232.

The previous prime is 1681151. The next prime is 1681157. The reversal of 1681155 is 5511861.

It is not a de Polignac number, because 1681155 - 2² = 1681151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1681151) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2539 + ... + 3131.

2^1681155 is an apocalyptic number.

1681155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1681155 is an abundant number, since it is smaller than the sum of its proper divisors (1768797).

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

1681155 is an equidigital number, since it uses as much as digits as its factorization.

1681155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 608 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 1681155 is about 1296.5936140518. The cubic root of 1681155 is about 118.9056757901.

The spelling of 1681155 in words is "one million, six hundred eighty-one thousand, one hundred fifty-five".