1681099 has 16 divisors (see below), whose sum is σ = 2031616. Its totient is φ = 1360800.

The previous prime is 1681091. The next prime is 1681103. The reversal of 1681099 is 9901861.

1681099 = 340² + 341² + ... + 353².

It is not a de Polignac number, because 1681099 - 2³ = 1681091 is a prime.

It is a super-3 number, since 3×1681099³ = 14252830624333239897, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13174 + ... + 13300.

It is an arithmetic number, because the mean of its divisors is an integer number (126976).

2^1681099 is an apocalyptic number.

1681099 is a deficient number, since it is larger than the sum of its proper divisors (350517).

1681099 is a wasteful number, since it uses less digits than its factorization.

1681099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1681099 is about 1296.5720188250. The cubic root of 1681099 is about 118.9043555089.

The spelling of 1681099 in words is "one million, six hundred eighty-one thousand, ninety-nine".