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491692389 = 3163897463
BaseRepresentation
bin11101010011101…
…010000101100101
31021021012120011020
4131103222011211
52001333124024
6120442401353
715120213336
oct3523520545
91237176136
10491692389
11232602851
12118800259
137ab36956
144943228d
152d276979
hex1d4ea165

491692389 has 4 divisors (see below), whose sum is σ = 655589856. Its totient is φ = 327794924.

The previous prime is 491692379. The next prime is 491692417. The reversal of 491692389 is 983296194.

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.

It is a cyclic number.

It is not a de Polignac number, because 491692389 - 29 = 491691877 is a prime.

It is a super-2 number, since 2×4916923892 = 483522810801054642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491692319) 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, 81948729 + ... + 81948734.

It is an arithmetic number, because the mean of its divisors is an integer number (163897464).

Almost surely, 2491692389 is an apocalyptic number.

It is an amenable number.

491692389 is a deficient number, since it is larger than the sum of its proper divisors (163897467).

491692389 is a wasteful number, since it uses less digits than its factorization.

491692389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163897466.

The product of its digits is 839808, while the sum is 51.

The square root of 491692389 is about 22174.1378411879. The cubic root of 491692389 is about 789.2801159862.

The spelling of 491692389 in words is "four hundred ninety-one million, six hundred ninety-two thousand, three hundred eighty-nine".

Divisors: 1 3 163897463 491692389