1015861 has 16 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 776880.

The previous prime is 1015853. The next prime is 1015871. The reversal of 1015861 is 1685101.

It is a cyclic number.

It is not a de Polignac number, because 1015861 - 2³ = 1015853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1015871) 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, 6000 + ... + 6166.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2^1015861 is an apocalyptic number.

1015861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1015861 is a deficient number, since it is larger than the sum of its proper divisors (274379).

1015861 is a wasteful number, since it uses less digits than its factorization.

1015861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1015861 is about 1007.8993005256. The cubic root of 1015861 is about 100.5259291363.

Adding to 1015861 its product of nonzero digits (240), we get a palindrome (1016101).

The spelling of 1015861 in words is "one million, fifteen thousand, eight hundred sixty-one".