785121 has 4 divisors (see below), whose sum is σ = 1046832. Its totient is φ = 523412.

The previous prime is 785119. The next prime is 785123. The reversal of 785121 is 121587.

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: 121587 = 3 ⋅40529.

It is an interprime number because it is at equal distance from previous prime (785119) and next prime (785123).

It is a cyclic number.

It is not a de Polignac number, because 785121 - 2¹ = 785119 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 785091 and 785100.

It is not an unprimeable number, because it can be changed into a prime (785123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130851 + ... + 130856.

It is an arithmetic number, because the mean of its divisors is an integer number (261708).

2⁷⁸⁵¹²¹ is an apocalyptic number.

It is an amenable number.

785121 is a deficient number, since it is larger than the sum of its proper divisors (261711).

785121 is a wasteful number, since it uses less digits than its factorization.

785121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261710.

The product of its digits is 560, while the sum is 24.

The square root of 785121 is about 886.0705389527. The cubic root of 785121 is about 92.2526530329.

The spelling of 785121 in words is "seven hundred eighty-five thousand, one hundred twenty-one".