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315989 = 1916631
BaseRepresentation
bin1001101001001010101
3121001110022
41031021111
540102424
610434525
72454152
oct1151125
9531408
10315989
111a6453
12132a45
13b0a9b
1483229
156395e
hex4d255

315989 has 4 divisors (see below), whose sum is σ = 332640. Its totient is φ = 299340.

The previous prime is 315977. The next prime is 316003. The reversal of 315989 is 989513.

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: 989513 = 7141359.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-315989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315949) 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, 8297 + ... + 8334.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2315989 is an apocalyptic number.

It is an amenable number.

315989 is a deficient number, since it is larger than the sum of its proper divisors (16651).

315989 is a wasteful number, since it uses less digits than its factorization.

315989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16650.

The product of its digits is 9720, while the sum is 35.

The square root of 315989 is about 562.1289887561. The cubic root of 315989 is about 68.1120557288.

The spelling of 315989 in words is "three hundred fifteen thousand, nine hundred eighty-nine".

Divisors: 1 19 16631 315989