Search a number
-
+
725791 = 1165981
BaseRepresentation
bin10110001001100011111
31100212121011
42301030133
5141211131
623320051
76112003
oct2611437
91325534
10725791
11456330
122b0027
131c5481
1414c703
15e50b1
hexb131f

725791 has 4 divisors (see below), whose sum is σ = 791784. Its totient is φ = 659800.

The previous prime is 725789. The next prime is 725801. The reversal of 725791 is 197527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197527 = 1117957.

It is a cyclic number.

It is not a de Polignac number, because 725791 - 21 = 725789 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32980 + ... + 33001.

It is an arithmetic number, because the mean of its divisors is an integer number (197946).

2725791 is an apocalyptic number.

725791 is a deficient number, since it is larger than the sum of its proper divisors (65993).

725791 is a wasteful number, since it uses less digits than its factorization.

725791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65992.

The product of its digits is 4410, while the sum is 31.

The square root of 725791 is about 851.9336828650. The cubic root of 725791 is about 89.8677481425.

The spelling of 725791 in words is "seven hundred twenty-five thousand, seven hundred ninety-one".

Divisors: 1 11 65981 725791