919861 has 4 divisors (see below), whose sum is σ = 927232. Its totient is φ = 912492.

The previous prime is 919859. The next prime is 919871. The reversal of 919861 is 168919.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 168919 = 31 ⋅5449.

It is a cyclic number.

It is not a de Polignac number, because 919861 - 2¹ = 919859 is a prime.

It is a super-2 number, since 2×919861² = 1692288518642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3495 + ... + 3748.

It is an arithmetic number, because the mean of its divisors is an integer number (231808).

2⁹¹⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

919861 is a deficient number, since it is larger than the sum of its proper divisors (7371).

919861 is a wasteful number, since it uses less digits than its factorization.

919861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7370.

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

The square root of 919861 is about 959.0938431666. The cubic root of 919861 is about 97.2539841923.

The spelling of 919861 in words is "nine hundred nineteen thousand, eight hundred sixty-one".