1013661 has 16 divisors (see below), whose sum is σ = 1638720. Its totient is φ = 614160.

The previous prime is 1013641. The next prime is 1013671. The reversal of 1013661 is 1663101.

1013661 is a `hidden beast` number, since 1 + 0 + 1 + 3 + 661 = 666.

It is not a de Polignac number, because 1013661 - 2⁵ = 1013629 is a prime.

It is a Curzon number.

1013661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013641) 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, 1410 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (102420).

2^1013661 is an apocalyptic number.

1013661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1013661 is a deficient number, since it is larger than the sum of its proper divisors (625059).

1013661 is a wasteful number, since it uses less digits than its factorization.

1013661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3433 (or 3427 counting only the distinct ones).

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

The square root of 1013661 is about 1006.8073301283. The cubic root of 1013661 is about 100.4533086741.

Adding to 1013661 its reverse (1663101), we get a palindrome (2676762).

The spelling of 1013661 in words is "one million, thirteen thousand, six hundred sixty-one".