1661031 has 6 divisors (see below), whose sum is σ = 2399280. Its totient is φ = 1107348.

The previous prime is 1661029. The next prime is 1661059. The reversal of 1661031 is 1301661.

1661031 is a `hidden beast` number, since 1 + 661 + 0 + 3 + 1 = 666.

It is not a de Polignac number, because 1661031 - 2¹ = 1661029 is a prime.

It is a super-2 number, since 2×1661031² = 5518047965922, which contains 22 as substring.

1661031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1660995 and 1661013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661021) 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 5 ways as a sum of consecutive naturals, for example, 92271 + ... + 92288.

It is an arithmetic number, because the mean of its divisors is an integer number (399880).

2^1661031 is an apocalyptic number.

1661031 is a deficient number, since it is larger than the sum of its proper divisors (738249).

1661031 is a wasteful number, since it uses less digits than its factorization.

1661031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184565 (or 184562 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1661031 is about 1288.8099161630. The cubic root of 1661031 is about 118.4293228064.

Adding to 1661031 its reverse (1301661), we get a palindrome (2962692).

It can be divided in two parts, 16610 and 31, that added together give a square (16641 = 129²).

The spelling of 1661031 in words is "one million, six hundred sixty-one thousand, thirty-one".