919121 has 4 divisors (see below), whose sum is σ = 1050432. Its totient is φ = 787812.

The previous prime is 919111. The next prime is 919129. The reversal of 919121 is 121919.

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: 121919 = 7 ⋅17417.

It is a cyclic number.

It is not a de Polignac number, because 919121 - 2¹⁸ = 656977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919129) 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, 65645 + ... + 65658.

It is an arithmetic number, because the mean of its divisors is an integer number (262608).

2⁹¹⁹¹²¹ is an apocalyptic number.

It is an amenable number.

919121 is a deficient number, since it is larger than the sum of its proper divisors (131311).

919121 is a wasteful number, since it uses less digits than its factorization.

919121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131310.

The product of its digits is 162, while the sum is 23.

The square root of 919121 is about 958.7079847378. The cubic root of 919121 is about 97.2278979120.

The spelling of 919121 in words is "nine hundred nineteen thousand, one hundred twenty-one".